# Draft California 2012 Integrated Report( 303(d) List/305(b) Report)

# Supporting Information

## Regional Board 6 - Lahontan Region

Water Body Name: | Amargosa River (Upper Canyon to Willow Creek confluence)
Water Body ID: | CAR6094200020080816182930
Water Body Type: | River & Stream

DECISION ID | 28507 | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)

Pollutant: | Arsenic
Final Listing Decision: | Delist from 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: | List on 303(d) list (TMDL required list)(2010)
Revision Status | Revised
Reason for Delisting: | Not a true delisting. Delisting due to spatial change or other CalWQA administrative reason
Impairment from Pollutant or Pollution: | Pollutant
Regional Board Staff Conclusion: | This is not a true delisting because this listing was initially incorrectly referred to as Amargosa River (Upper Canyon to Willow Creek confluence). This waterbody/pollutant combination has been moved to the correct waterbody, and is now listed as Amargosa River (Willow Creek confluence to Badwater). The actual assessment can be found in the corresponding decision for Amargosa River (Willow Creek confluence to Badwater.) The mapped representation of this waterbody was corrected this cycle. This decision is being decommissioned (to be retired next cycle).
Regional Board Staff Decision Recommendation: | The mapped representation of this waterbody was corrected this cycle. This decision is being decommissioned (to be retired next cycle) while while a copy of it as a "List" now lives with the new mapped representation of this waterbody. Amargosa River (Willow Creek confluence to Badwater).

Line of Evidence (LOE) for Decision ID 28507, Arsenic | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)
LOE ID: | 25049
Pollutant: | Arsenic
LOE Subgroup: | Pollutant-Water
Matrix: | Water
Fraction: | Total
Beneficial Use: | Inland Saline Water Habitat
Number of Samples: | 2
Number of Exceedances: | 0
Data and Information Type: | Fixed station physical/chemical (conventional plus toxic pollutants)
Data Used to Assess Water Quality: | The U.S. Geological Survey sampled this station on on March 18, 2004 and March 16, 2005 under the Region 6 SWAMP program. Concentrations of total arsenic in two samples were 215 and 178 ug/L.
Data Reference: | 2007. SWAMP Data for the Amargosa Hydrologic Unit
SWAMP Data: | SWAMP
Water Quality Objective/Criterion: | There are no applicable state or federal saltwater aquatic life standards or criteria for total arsenic in inland saline waters.
Objective/Criterion Reference: | Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | One station, Amargosa River below Willow Creek, was sampled.
Temporal Representation: | Two samples were collected on March 18, 2004 and March 16, 2005.
Environmental Conditions: | The Amargosa River flows into California from Nevada and terminates in Death Valley. It is mostly ephemeral but there are perennial reaches. There is great seasonal and annual variability in flows. Most of the watershed is U.S. Bureau of Land Management or National Park land. The Amargosa River is not designated for the Municipal and Domestic Supply (MUN) beneficial use. The MUN use designation was removed in Basin Plan amendments that took effect in 2002. The rationale for removing the use included naturally high salinity and levels of toxic substances such as arsenic, and fluctuating water quantity that would make the river an unreliable supply if treatment were feasible. The perennial reaches of the Amargosa River and the associated riparian areas support a complex of rare, threatened or endangered fish and wildlife species. To Lahontan Water Board staffs knowledge, there are no salmonids in the river and there is no warm water fishery for human consumption.
QAPP Information: | The data meet the quality assurance requirements of the SWAMP QAPP.
QAPP Information Reference(s):
Line of Evidence (LOE) for Decision ID 28507, Arsenic | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)
LOE ID: | 24930
Pollutant: | Arsenic
LOE Subgroup: | Pollutant-Sediment
Matrix: | Sediment
Fraction: | None
Beneficial Use: | Inland Saline Water Habitat
Number of Samples: | 1
Number of Exceedances: | 0
Data and Information Type: | Chemical monitoring of sediments
Data Used to Assess Water Quality: | The U.S. Geological Survey sampled sediment at this station on March 16, 2005 under the Region 6 SWAMP program. Results were reported as "bed sediment, smaller than 62.5 um, wet sieved, total digestion." The concentration of arsenic was 12 ug/g dry weight.
Data Reference: | 2007. SWAMP Data for the Amargosa Hydrologic Unit
SWAMP Data: | SWAMP
Water Quality Objective/Criterion: | There are no state or federal standards or criteria for arsenic in sediment in inland saline waters. The Effects Range-Median for arsenic in marine and estuarine sediments is 70 ug/g dry weight; see Long et al. (1995).
Objective/Criterion Reference: | Incidence of adverse biological effects within ranges of chemical concentrations in marine and estuary sediments. Environmental Management. 19, (1): 81-97
| Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | One station, Amargosa River below Willow Creek, was sampled.
Temporal Representation: | One sediment sample was collected on March 16, 2005.
Environmental Conditions: | The Amargosa River flows into California from Nevada and terminates in Death Valley. It is mostly ephemeral but there are perennial reaches. There is great seasonal and annual variability in flows. Most of the watershed is U.S. Bureau of Land Management or National Park land. The Amargosa River is not designated for the Municipal and Domestic Supply (MUN) beneficial use. The MUN use designation was removed in Basin Plan amendments that took effect in 2002. The rationale for removing the use included naturally high salinity and levels of toxic substances such as arsenic, and fluctuating water quantity that would make the river an unreliable supply if treatment were feasible. The perennial reaches of the Amargosa River and the associated riparian areas support a complex of rare, threatened or endangered fish and wildlife species. To Lahontan Water Board staffs knowledge, there are no salmonids in the river and there is no warm water fishery for human consumption.
QAPP Information: | The data meet the quality assurance requirements of the SWAMP QAPP.
QAPP Information Reference(s):
Line of Evidence (LOE) for Decision ID 28507, Arsenic | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)
LOE ID: | 25050
Pollutant: | Arsenic
LOE Subgroup: | Pollutant-Water
Matrix: | Water
Fraction: | Dissolved
Beneficial Use: | Inland Saline Water Habitat
Number of Samples: | 2
Number of Exceedances: | 2
Data and Information Type: | Fixed station physical/chemical (conventional plus toxic pollutants)
Data Used to Assess Water Quality: | The U.S. Geological Survey sampled this station on on March 18, 2004 and March 16, 2005 under the Region 6 SWAMP program. Concentrations of dissolved arsenic in two samples were 207 and 170 ug/L.
Data Reference: | 2007. SWAMP Data for the Amargosa Hydrologic Unit
SWAMP Data: | SWAMP
Water Quality Objective/Criterion: | The California Toxics Rule's saltwater aquatic life standards for dissolved arsenic include an acute toxicity limit of69 u/L and a chonic toxicity limit of 36 ug/L.
Objective/Criterion Reference: | Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | One station, Amargosa River below Willow Creek, was sampled.
Temporal Representation: | Two samples were collected on March 18, 2004 and March 16, 2005.
Environmental Conditions: | The Amargosa River flows into California from Nevada and terminates in Death Valley. It is mostly ephemeral but there are perennial reaches. There is great seasonal and annual variability in flows. Most of the watershed is U.S. Bureau of Land Management or National Park land. The Amargosa River is not designated for the Municipal and Domestic Supply (MUN) beneficial use. The MUN use designation was removed in Basin Plan amendments that took effect in 2002. The rationale for removing the use included naturally high salinity and levels of toxic substances such as arsenic, and fluctuating water quantity that would make the river an unreliable supply if treatment were feasible. The perennial reaches of the Amargosa River and the associated riparian areas support a complex of rare, threatened or endangered fish and wildlife species. To Lahontan Water Board staffs knowledge, there are no salmonids in the river and there is no warm water fishery for human consumption.
QAPP Information: | The data meet the quality assurance requirements of the SWAMP QAPP.
QAPP Information Reference(s):

DECISION ID | 24351 | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)

Pollutant: | 1, 1, 2-trichloro-1, 2, 2-trifluoroethane | 1, 1-dichloroethane | 2, 4 D methyl ester / 2,4-Dichlorophenoxyacetic acid methyl ester | 2, 4 DB / 4-(2,4-dichlorophenoxy) butyric acid | 2,4-D (2,4-Dichlorophenoxy acetic acid) | 2-Methyl-4-chlorophenoxyacetic acid (MCPA):acetic acid | 2-chloro-4-isopropylamino-6-amino-s-triazine | 2-chloro-6-ethylamino-4-amino-s-triazine | 3-ketocarbofuran | 4(4 chloro-2-methyl phenoxy (MCPB)) butanoic acid | Aciflorfen | Aldicarb | Aldicarb sulfone | Aldicarb sulfoxide | Bendiocarb | Benomyl | Bensulfuron | Bentazon | Bromacil | Bromoxynil | Carbofuran | Chloramben methyl ester | Chlorimuron | Chlorodiamino-s-triazine | Chloropyralid | Chlorothalonil | Cycloate | Dacthal monoacid | Dicamba | Dichloroprop | Diethyl ether | Diisopropyl ether | Dinoseb | Diphenamid | Diuron | Fenuron | Flometuron | Flumetsulam | Hydroxyl carbofuran | Imazaquin | Imazethapyr | Imidacloprid | Linuron | Metalaxyl | Methiocarb | Methomyl | Methyl tert-pentyl ether | Metsulfuron | N-(4-Chlorophenyl) -N' methylurea / Monuron | Neburon | Nicosulfuron | Norflurazon | Oryzalin | Oxamyl (Vydate) | Picloram | Propham | Propiconazol | Propoxur | Siduron | Styrene | Sulfometuron | Tebuthuron | Terbacil | Tert-butyl ethyl ether | Triazone | Tribenuron | Vinyl chloride | meta-para xylenes | o-Xylene
Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)(2010)
Revision Status | Revised
Impairment from Pollutant or Pollution: | Pollutant
Regional Board Staff Conclusion: | The LOE was incorrectly assigned to the waterbody so there is no data available for this waterbody/pollutant combination. The mapped representation of this waterbody corrected this cycle. This decision is being decommissioned (to be retired next cycle) while a copy of it as a "Do Not List" now lives with the new mapped representation of this waterbody.
Regional Board Staff Decision Recommendation: |

Line of Evidence (LOE) for Decision ID 24351, Multiple Pollutants | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)
LOE ID: | 25227
Pollutant: | 1, 1, 2-trichloro-1, 2, 2-trifluoroethane | 1, 1-dichloroethane | 2, 4 D methyl ester / 2,4-Dichlorophenoxyacetic acid methyl ester | 2, 4 DB / 4-(2,4-dichlorophenoxy) butyric acid | 2,4-D (2,4-Dichlorophenoxy acetic acid) | 2-Methyl-4-chlorophenoxyacetic acid (MCPA):acetic acid | 2-chloro-4-isopropylamino-6-amino-s-triazine | 2-chloro-6-ethylamino-4-amino-s-triazine | 3-ketocarbofuran | 4(4 chloro-2-methyl phenoxy (MCPB)) butanoic acid | Aciflorfen | Aldicarb | Aldicarb sulfone | Aldicarb sulfoxide | Bendiocarb | Benomyl | Bensulfuron | Bentazon | Bromacil | Bromoxynil | Carbofuran | Chloramben methyl ester | Chlorimuron | Chlorodiamino-s-triazine | Chloropyralid | Chlorothalonil | Cycloate | Dacthal monoacid | Dicamba | Dichloroprop | Diethyl ether | Diisopropyl ether | Dinoseb | Diphenamid | Diuron | Fenuron | Flometuron | Flumetsulam | Hydroxyl carbofuran | Imazaquin | Imazethapyr | Imidacloprid | Linuron | Metalaxyl | Methiocarb | Methomyl | Methyl tert-pentyl ether | Metsulfuron | N-(4-Chlorophenyl) -N' methylurea / Monuron | Neburon | Nicosulfuron | Norflurazon | Oryzalin | Oxamyl (Vydate) | Picloram | Propham | Propiconazol | Propoxur | Siduron | Styrene | Sulfometuron | Tebuthuron | Terbacil | Tert-butyl ethyl ether | Triazone | Tribenuron | Vinyl chloride | meta-para xylenes | o-Xylene
LOE Subgroup: | Pollutant-Water
Matrix: | Water
Fraction: | None
Beneficial Use: | Inland Saline Water Habitat
Number of Samples: | 1
Number of Exceedances: | 0
Data and Information Type: | Fixed station physical/chemical (conventional plus toxic pollutants)
Data Used to Assess Water Quality: | The U.S. Geological Survey sampled organic chemicals at this station on March 18, 2004 under the Region 6 SWAMP program. One sampling result was reported for each of the listed pollutants. All of these pollutants were below the detection level.
Data Reference: | 2007. SWAMP Data for the Amargosa Hydrologic Unit
SWAMP Data: | SWAMP
Water Quality Objective/Criterion: | There are no applicable state or federal saltwater standards or criteria for the listed pollutants.
Objective/Criterion Reference: | Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | One station, Amargosa River below Willow Creek, was sampled.
Temporal Representation: | One sampling result was reported for each of the listed pollutants from a sample or samples collected on March 18, 2004
Environmental Conditions: | The Amargosa River flows into California from Nevada and terminates in Death Valley. It is mostly ephemeral but there are perennial reaches. There is great seasonal and annual variability in flows. Most of the watershed is U.S. Bureau of Land Management or National Park land. The Amargosa River is not designated for the Municipal and Domestic Supply (MUN) beneficial use. The MUN use designation was removed in Basin Plan amendments that took effect in 2002. The rationale for removing the use included naturally high salinity and levels of toxic substances such as arsenic, and fluctuating water quantity that would make the river an unreliable supply if treatment were feasible. The perennial reaches of the Amargosa River and the associated riparian areas support a complex of rare, threatened or endangered fish and wildlife species. To Lahontan Water Board staffs knowledge, there are no salmonids in the river and there is no warm water fishery for human consumption.
QAPP Information: | The data meet the quality assurance requirements of the SWAMP QAPP.
QAPP Information Reference(s):

DECISION ID | 24932 | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)

Pollutant: | 1, 3 -dichlorobenzene | 1, 4 -dichlorobenzene | 1,1,1-Trichloroethane | 1,1-Dichloroethylene (DCE)/ Vinylidene Chloride | 1,2-Dichloroethylene,-trans | 1,2-Dichloropropane | Atrazine | Benzene | Bromoform | Carbaryl | Carbon tetrachloride | Chlorobenzene (mono) | Chlorodibromomethane | Chloroform | Dichlorobromomethane | Dichlorodifluoromethane | Dichloromethane | Ethylbenzene | Methyl Tertiary-Butyl Ether (MTBE) | Tetrachloroethylene/PCE | Toluene | Trichloroethene | Trichlorofluoromethane (CFC-11) | cis-1,2-Dichloroethylene
Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)(2010)
Revision Status | Revised
Impairment from Pollutant or Pollution: | Pollutant
Regional Board Staff Conclusion: | This listing was initially incorrectly referred to as Amargosa River (Upper Canyon to Willow Creek confluence). This waterbody/pollutant combination has been moved to the correct waterbody, and is now listed as Amargosa River (Willow Creek confluence to Badwater). The actual assessment can be found in the corresponding decision for Amargosa River (Willow Creek confluence to Badwater.) The mapped representation of this waterbody was corrected this cycle. This decision is being decommissioned (to be retired next cycle) while a copy of it as a "Do Not List" now lives with the new mapped representation of this waterbody (Amargosa River-Willow Creek confluence to Badwater.) These pollutants are being considered for placement on the section 303(d) list under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status. One line of evidence is available in the administrative record to assess this pollutant. None of the samples exceeds the applicable criteria. (All pollutants were at non-detectable levels, and under Listing Policy Section 6.1.5.5, the standards are presumed to be attained.) Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the section 303(d) list in the Water Quality Limited Segments category. This conclusion is based on the staff findings that: 1. The data used satisfy the data quality requirements of section 6.1.4 of the Policy. 2. The data used do not satisfy the data quantity requirements of section 6.1.5 of the Policy in that only one sample per pollutant was available. 3. None of the single samples for each pollutant exceeded the applicable criterion and this does not exceed the allowable frequency listed in Table 3.1 of the Listing Policy. However, the minimum sample number requirements of Table 3.1 were not met. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
Regional Board Staff Decision Recommendation: | The mapped representation of this waterbody was corrected this cycle. This decision is being decommissioned (to be retired next cycle) while a copy of it as a "Do Not List" now lives with the new mapped representation of this waterbody (Amargosa River-Willow Creek confluence to Badwater.) After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because applicable water quality standards are not being exceeded.

Line of Evidence (LOE) for Decision ID 24932, Multiple Pollutants | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)
LOE ID: | 25413
Pollutant: | 1, 3 -dichlorobenzene | 1, 4 -dichlorobenzene | 1,1,1-Trichloroethane | 1,1-Dichloroethylene (DCE)/ Vinylidene Chloride | 1,2-Dichloroethylene,-trans | 1,2-Dichloropropane | Atrazine | Benzene | Bromoform | Carbaryl | Carbon tetrachloride | Chlorobenzene (mono) | Chlorodibromomethane | Chloroform | Dichlorobromomethane | Dichlorodifluoromethane | Dichloromethane | Ethylbenzene | Methyl Tertiary-Butyl Ether (MTBE) | Tetrachloroethylene/PCE | Toluene | Trichloroethene | Trichlorofluoromethane (CFC-11) | cis-1,2-Dichloroethylene
LOE Subgroup: | Pollutant-Water
Matrix: | Water
Fraction: | Total
Beneficial Use: | Inland Saline Water Habitat
Number of Samples: | 1
Number of Exceedances: | 0
Data and Information Type: | Fixed station physical/chemical (conventional plus toxic pollutants)
Data Used to Assess Water Quality: | The U.S. Geological Survey sampled this station on March 17, 2004. Concentrations of the listed pollutants were all below the detection level.
Data Reference: | 2007. SWAMP Data for the Amargosa Hydrologic Unit
SWAMP Data: | SWAMP
Water Quality Objective/Criterion: | (In the following summary of criteria, when a single concentration is listed, it is the acute toxicity limit. When two concentrations are listed, the first number is the acute toxicity limit and the second is the chronic toxicity limit. U.S. Environmental Protection Agency (USEPA) national recommended saltwater aquatic life criteria for the following pollutants are as follows: atrazine, 760 ug/L/17 ug/L; carbaryl, 0.81 ug/L/0.81 ug/L; methyl tertiary butyl ether (MTBE), 53,000 ug/L/ 18,000 ug/L. The USEPA saltwater "Lowest Observed Effect Level" (LOEL) criteria are as follows: 1, 1, 1 trichloroethane, 31,200 ug/L; 1,1 dichloroethene, 224, 000 ug/L; 1, 2 dichloropropane, 10,300 ug/L; 1, 3 dichlorobenzene, 1970 ug/L/129 ug/L; 1, 4 dichlorobenzene, 1970 ug/L/ 129 ug/L; benzene, 5100 ug/L; bromodichloromethane, 12,000 ug/L/6400 ug/L; chlorobenzene 160 ug/L/129 ug/L;
Objective/Criterion Reference: | Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | One station, Amargosa River at USGS Gage (Tecopa) was sampled.
Temporal Representation: | One sample for each of the 24 listed pollutants was collected on March 17, 2004.
Environmental Conditions: | The Amargosa River flows into California from Nevada and terminates in Death Valley. It is mostly ephemeral but there are perennial reaches. There is great seasonal and annual variability in flows. Most of the watershed is U.S. Bureau of Land Management or National Park land. The Amargosa River is not designated for the Municipal and Domestic Supply (MUN) beneficial use. The MUN use designation was removed in Basin Plan amendments that took effect in 2002. The rationale for removing the use included naturally high salinity and levels of toxic substances such as arsenic, and fluctuating water quantity that would make the river an unreliable supply if treatment were feasible. The perennial reaches of the Amargosa River and the associated riparian areas support a complex of rare, threatened or endangered fish and wildlife species. To Lahontan Water Board staffs knowledge, there are no salmonids in the river and there is no warm water fishery for human consumption.
QAPP Information: | The data meet the quality assurance requirements of the SWAMP QAPP.
QAPP Information Reference(s):

DECISION ID | 28332 | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)

Pollutant: | Alkalinity, Carbonate as CaCO3
Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)(2010)
Revision Status | Revised
Impairment from Pollutant or Pollution: | Pollutant
Regional Board Staff Conclusion: | The LOE was incorrectly assigned to the waterbody so there is no data available for this waterbody/pollutant combination. The mapped representation of this waterbody was corrected this cycle. This decision is being decommissioned (to be retired next cycle) while a copy of it as a "Do Not List" now lives with the new mapped representation of this waterbody.
Regional Board Staff Decision Recommendation: |

Line of Evidence (LOE) for Decision ID 28332, Alkalinity, Carbonate as CaCO3 | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)
LOE ID: | 27148
Pollutant: | Alkalinity, Carbonate as CaCO3
LOE Subgroup: | Pollutant-Water
Matrix: | Water
Fraction: | None
Beneficial Use: | Inland Saline Water Habitat
Number of Samples: | 2
Number of Exceedances: | 0
Data and Information Type: | Fixed station physical/chemical (conventional plus toxic pollutants)
Data Used to Assess Water Quality: | The U.S. Geological Survey sampled this station on March 18, 2004 and March 16, 2005 under the Region 6 SWAMP program. Alkalinity values in two samples were 630 and 632 mg/L CaCO3.
Data Reference: | 2007. SWAMP Data for the Amargosa Hydrologic Unit
SWAMP Data: | SWAMP
Water Quality Objective/Criterion: | The USEPA's national water quality criteria recommend a minimum hardness of 20 mg/L calcium carbonate as a chronic criterion for the protection of freshwater aquatic life, unless the natural alkalinity level is lower. There are no applicable water qualitiy standards or criteria for alkalinity in inland saline waters.
Objective/Criterion Reference: | National recommended water quality criteria: 2002. EPA-822-R-02-047 Washington, D.C. USEPA
| Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | One station, Amargosa River below Willow Creek, was sampled.
Temporal Representation: | Two samples were collected on March 18, 2004 and March 16, 2005.
Environmental Conditions: | The Amargosa River flows into California from Nevada and terminates in Death Valley. It is mostly ephemeral but there are perennial reaches. There is great seasonal and annual variability in flows. Most of the watershed is U.S. Bureau of Land Management or National Park land. The Amargosa River is not designated for the Municipal and Domestic Supply (MUN) beneficial use. The MUN use designation was removed in Basin Plan amendments that took effect in 2002. The rationale for removing the use included naturally high salinity and levels of toxic substances such as arsenic, and fluctuating water quantity that would make the river an unreliable supply if treatment were feasible. The perennial reaches of the Amargosa River and the associated riparian areas support a complex of rare, threatened or endangered fish and wildlife species. To Lahontan Water Board staffs knowledge, there are no salmonids in the river and there is no warm water fishery for human consumption.
QAPP Information: | The data meet the quality assurance requirements of the SWAMP QAPP.
QAPP Information Reference(s):

DECISION ID | 24361 | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)

Pollutant: | Aluminum
Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)(2010)
Revision Status | Revised
Impairment from Pollutant or Pollution: | Pollutant
Regional Board Staff Conclusion: | The LOE was incorrectly assigned to the waterbody so there is no data available for this waterbody/pollutant combination. The mapped representation of this waterbody was corrected this cycle. This decision is being decommissioned (to be retired next cycle) while a copy of it as a "Do Not List" now lives with the new mapped representation of this waterbody.
Regional Board Staff Decision Recommendation: |

Line of Evidence (LOE) for Decision ID 24361, Aluminum | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)
LOE ID: | 25046
Pollutant: | Aluminum
LOE Subgroup: | Pollutant-Water
Matrix: | Water
Fraction: | Total
Beneficial Use: | Inland Saline Water Habitat
Number of Samples: | 2
Number of Exceedances: | 0
Data and Information Type: | Fixed station physical/chemical (conventional plus toxic pollutants)
Data Used to Assess Water Quality: | The U.S. Geological Survey sampled this station on on March 18, 2004 and March 16, 2005 under the Region 6 SWAMP program. Concentrations of total aluminum in two samples were 530 and 325 ug/L.
Data Reference: | 2007. SWAMP Data for the Amargosa Hydrologic Unit
SWAMP Data: | SWAMP
Water Quality Objective/Criterion: | There are no applicable state or federal standards or criteria for total aluminum in inland saline waters.
Objective/Criterion Reference: | Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | One station, Amargosa River below Willow Creek, was sampled.
Temporal Representation: | Two samples were collected on March 18, 2004 and March 16, 2005.
Environmental Conditions: | The Amargosa River flows into California from Nevada and terminates in Death Valley. It is mostly ephemeral but there are perennial reaches. There is great seasonal and annual variability in flows. Most of the watershed is U.S. Bureau of Land Management or National Park land. The Amargosa River is not designated for the Municipal and Domestic Supply (MUN) beneficial use. The MUN use designation was removed in Basin Plan amendments that took effect in 2002. The rationale for removing the use included naturally high salinity and levels of toxic substances such as arsenic, and fluctuating water quantity that would make the river an unreliable supply if treatment were feasible. The perennial reaches of the Amargosa River and the associated riparian areas support a complex of rare, threatened or endangered fish and wildlife species. To Lahontan Water Board staffs knowledge, there are no salmonids in the river and there is no warm water fishery for human consumption.
QAPP Information: | The data meet the quality assurance requirements of the SWAMP QAPP.
QAPP Information Reference(s):
Line of Evidence (LOE) for Decision ID 24361, Aluminum | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)
LOE ID: | 24892
Pollutant: | Aluminum
LOE Subgroup: | Pollutant-Sediment
Matrix: | Sediment
Fraction: | None
Beneficial Use: | Inland Saline Water Habitat
Number of Samples: | 1
Number of Exceedances: | 0
Data and Information Type: | Chemical monitoring of sediments
Data Used to Assess Water Quality: | The U.S. Geological Survey sampled sediment at this station on March 16, 2005 under the Region 6 SWAMP program. Results were reported as "bed sediment, smaller than 62.5 um, wet sieved, total digestion." The concentration of aluminum was 6 percent dry weight.
Data Reference: | 2007. SWAMP Data for the Amargosa Hydrologic Unit
SWAMP Data: | SWAMP
Water Quality Objective/Criterion: | There are no state or federal standards or criteria for aluminum in sediment in inland saline waters.
Objective/Criterion Reference: | Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | One station, Amargosa River below Willow Creek, was sampled.
Temporal Representation: | One sediment sample was collected on March 16, 2005.
Environmental Conditions: | The Amargosa River flows into California from Nevada and terminates in Death Valley. It is mostly ephemeral but there are perennial reaches. There is great seasonal and annual variability in flows. Most of the watershed is U.S. Bureau of Land Management or National Park land. The Amargosa River is not designated for the Municipal and Domestic Supply (MUN) beneficial use. The MUN use designation was removed in Basin Plan amendments that took effect in 2002. The rationale for removing the use included naturally high salinity and levels of toxic substances such as arsenic, and fluctuating water quantity that would make the river an unreliable supply if treatment were feasible. The perennial reaches of the Amargosa River and the associated riparian areas support a complex of rare, threatened or endangered fish and wildlife species. To Lahontan Water Board staffs knowledge, there are no salmonids in the river and there is no warm water fishery for human consumption.
QAPP Information: | The data meet the quality assurance requirements of the SWAMP QAPP.
QAPP Information Reference(s):
Line of Evidence (LOE) for Decision ID 24361, Aluminum | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)
LOE ID: | 25045
Pollutant: | Aluminum
LOE Subgroup: | Pollutant-Water
Matrix: | Water
Fraction: | Dissolved
Beneficial Use: | Inland Saline Water Habitat
Number of Samples: | 2
Number of Exceedances: | 0
Data and Information Type: | Fixed station physical/chemical (conventional plus toxic pollutants)
Data Used to Assess Water Quality: | The U.S. Geological Survey sampled this station on on March 18, 2004 and March 16, 2005 under the Region 6 SWAMP program. One of two samples was below the detection level and the concentration of dissolved aluminum in the other sample was an estimated value.
Data Reference: | 2007. SWAMP Data for the Amargosa Hydrologic Unit
SWAMP Data: | SWAMP
Water Quality Objective/Criterion: | There are no applicable state or federal standards or criteria for dissolved aluminum in inland saline waters.
Objective/Criterion Reference: | Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | One station, Amargosa River below Willow Creek, was sampled.
Temporal Representation: | Two samples were collected on March 18, 2004 and March 16, 2005.
Environmental Conditions: | The Amargosa River flows into California from Nevada and terminates in Death Valley. It is mostly ephemeral but there are perennial reaches. There is great seasonal and annual variability in flows. Most of the watershed is U.S. Bureau of Land Management or National Park land. The Amargosa River is not designated for the Municipal and Domestic Supply (MUN) beneficial use. The MUN use designation was removed in Basin Plan amendments that took effect in 2002. The rationale for removing the use included naturally high salinity and levels of toxic substances such as arsenic, and fluctuating water quantity that would make the river an unreliable supply if treatment were feasible. The perennial reaches of the Amargosa River and the associated riparian areas support a complex of rare, threatened or endangered fish and wildlife species. To Lahontan Water Board staffs knowledge, there are no salmonids in the river and there is no warm water fishery for human consumption.
QAPP Information: | The data meet the quality assurance requirements of the SWAMP QAPP.
QAPP Information Reference(s):

DECISION ID | 24769 | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)

Pollutant: | Antimony
Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)(2010)
Revision Status | Revised
Impairment from Pollutant or Pollution: | Pollutant
Regional Board Staff Conclusion: | The LOE was incorrectly assigned to the waterbody so there is no data available for this waterbody/pollutant combination. The mapped representation of this waterbody was corrected this cycle. This decision is being decommissioned (to be retired next cycle) while a copy of it as a "Do Not List" now lives with the new mapped representation of this waterbody.
Regional Board Staff Decision Recommendation: |

Line of Evidence (LOE) for Decision ID 24769, Antimony | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)
LOE ID: | 24929
Pollutant: | Antimony
LOE Subgroup: | Pollutant-Sediment
Matrix: | Sediment
Fraction: | None
Beneficial Use: | Inland Saline Water Habitat
Number of Samples: | 1
Number of Exceedances: | 0
Data and Information Type: | Chemical monitoring of sediments
Data Used to Assess Water Quality: | The U.S. Geological Survey sampled sediment at this station on March 16, 2005 under the Region 6 SWAMP program. Results were reported as "bed sediment, smaller than 62.5 um, wet sieved, total digestion." The concentration of antimony was 0.7 ug/g dry weight.
Data Reference: | 2007. SWAMP Data for the Amargosa Hydrologic Unit
SWAMP Data: | SWAMP
Water Quality Objective/Criterion: | There are no state or federal standards or criteria for antimony in sediment in inland saline waters. The Effects Range-Median for antimony in marine and estuarine sediments is 25 ug/g dry weight; see Long et al. (1995).
Objective/Criterion Reference: | Incidence of adverse biological effects within ranges of chemical concentrations in marine and estuary sediments. Environmental Management. 19, (1): 81-97
| Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | One station, Amargosa River below Willow Creek, was sampled.
Temporal Representation: | One sediment sample was collected on March 16, 2005.
Environmental Conditions: | The Amargosa River flows into California from Nevada and terminates in Death Valley. It is mostly ephemeral but there are perennial reaches. There is great seasonal and annual variability in flows. Most of the watershed is U.S. Bureau of Land Management or National Park land. The Amargosa River is not designated for the Municipal and Domestic Supply (MUN) beneficial use. The MUN use designation was removed in Basin Plan amendments that took effect in 2002. The rationale for removing the use included naturally high salinity and levels of toxic substances such as arsenic, and fluctuating water quantity that would make the river an unreliable supply if treatment were feasible. The perennial reaches of the Amargosa River and the associated riparian areas support a complex of rare, threatened or endangered fish and wildlife species. To Lahontan Water Board staffs knowledge, there are no salmonids in the river and there is no warm water fishery for human consumption.
QAPP Information: | The data meet the quality assurance requirements of the SWAMP QAPP.
QAPP Information Reference(s):
Line of Evidence (LOE) for Decision ID 24769, Antimony | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)
LOE ID: | 25048
Pollutant: | Antimony
LOE Subgroup: | Pollutant-Water
Matrix: | Water
Fraction: | Dissolved
Beneficial Use: | Inland Saline Water Habitat
Number of Samples: | 2
Number of Exceedances: | 0
Data and Information Type: | Fixed station physical/chemical (conventional plus toxic pollutants)
Data Used to Assess Water Quality: | The U.S. Geological Survey sampled this station on on March 18, 2004 and March 16, 2005 under the Region 6 SWAMP program. Concentrations of dissolved antimony in two samples were 0.55 and 0.59 ug/L.
Data Reference: | 2007. SWAMP Data for the Amargosa Hydrologic Unit
SWAMP Data: | SWAMP
Water Quality Objective/Criterion: | There are no applicable state or federal standards or criteria for dissolved antimony in inland saline waters.
Objective/Criterion Reference: | Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | One station, Amargosa River below Willow Creek, was sampled.
Temporal Representation: | Two samples were collected on March 18, 2004 and March 16, 2005.
Environmental Conditions: | The Amargosa River flows into California from Nevada and terminates in Death Valley. It is mostly ephemeral but there are perennial reaches. There is great seasonal and annual variability in flows. Most of the watershed is U.S. Bureau of Land Management or National Park land. The Amargosa River is not designated for the Municipal and Domestic Supply (MUN) beneficial use. The MUN use designation was removed in Basin Plan amendments that took effect in 2002. The rationale for removing the use included naturally high salinity and levels of toxic substances such as arsenic, and fluctuating water quantity that would make the river an unreliable supply if treatment were feasible. The perennial reaches of the Amargosa River and the associated riparian areas support a complex of rare, threatened or endangered fish and wildlife species. To Lahontan Water Board staffs knowledge, there are no salmonids in the river and there is no warm water fishery for human consumption.
QAPP Information: | The data meet the quality assurance requirements of the SWAMP QAPP.
QAPP Information Reference(s):
Line of Evidence (LOE) for Decision ID 24769, Antimony | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)
LOE ID: | 25047
Pollutant: | Antimony
LOE Subgroup: | Pollutant-Water
Matrix: | Water
Fraction: | Total
Beneficial Use: | Inland Saline Water Habitat
Number of Samples: | 2
Number of Exceedances: | 0
Data and Information Type: | Fixed station physical/chemical (conventional plus toxic pollutants)
Data Used to Assess Water Quality: | The U.S. Geological Survey sampled this station on on March 18, 2004 and March 16, 2005 under the Region 6 SWAMP program. Concentrations of total antimony in two samples were 0.4 and 0.6 ug/L.
Data Reference: | 2007. SWAMP Data for the Amargosa Hydrologic Unit
SWAMP Data: | SWAMP
Water Quality Objective/Criterion: | There are no applicable state or federal standards or criteria for total antimony in inland saline waters.
Objective/Criterion Reference: | Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | One station, Amargosa River below Willow Creek, was sampled.
Temporal Representation: | Two samples were collected on March 18, 2004 and March 16, 2005.
Environmental Conditions: | The Amargosa River flows into California from Nevada and terminates in Death Valley. It is mostly ephemeral but there are perennial reaches. There is great seasonal and annual variability in flows. Most of the watershed is U.S. Bureau of Land Management or National Park land. The Amargosa River is not designated for the Municipal and Domestic Supply (MUN) beneficial use. The MUN use designation was removed in Basin Plan amendments that took effect in 2002. The rationale for removing the use included naturally high salinity and levels of toxic substances such as arsenic, and fluctuating water quantity that would make the river an unreliable supply if treatment were feasible. The perennial reaches of the Amargosa River and the associated riparian areas support a complex of rare, threatened or endangered fish and wildlife species. To Lahontan Water Board staffs knowledge, there are no salmonids in the river and there is no warm water fishery for human consumption.
QAPP Information: | The data meet the quality assurance requirements of the SWAMP QAPP.
QAPP Information Reference(s):

DECISION ID | 23946 | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)

Pollutant: | Barium
Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)(2010)
Revision Status | Revised
Impairment from Pollutant or Pollution: | Pollutant
Regional Board Staff Conclusion: | The LOE was incorrectly assigned to the waterbody so there is no data available for this waterbody/pollutant combination. The mapped representation of this waterbody was corrected this cycle. This decision is being decommissioned (to be retired next cycle) while a copy of it as a "Do Not List" now lives with the new mapped representation of this waterbody.
Regional Board Staff Decision Recommendation: |

Line of Evidence (LOE) for Decision ID 23946, Barium | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)
LOE ID: | 24896
Pollutant: | Barium
LOE Subgroup: | Pollutant-Sediment
Matrix: | Sediment
Fraction: | None
Beneficial Use: | Inland Saline Water Habitat
Number of Samples: | 1
Number of Exceedances: | 0
Data and Information Type: | Chemical monitoring of sediments
Data Used to Assess Water Quality: | The U.S. Geological Survey sampled sediment at this station on March 18 2004 under the Region 6 SWAMP program. Results were reported as "bed sediment, smaller than 62.5 um, wet sieved, total digestion." The concentration of barium was 790 ug/g dry weight.
Data Reference: | 2007. SWAMP Data for the Amargosa Hydrologic Unit
SWAMP Data: | SWAMP
Water Quality Objective/Criterion: | There are no state or federal standards or criteria for barium in sediment in inland saline waters.
Objective/Criterion Reference: | Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | One station, Amargosa River below Willow Creek, was sampled.
Temporal Representation: | One sediment sample was collected on March 18, 2004.
Environmental Conditions: | The Amargosa River flows into California from Nevada and terminates in Death Valley. It is mostly ephemeral but there are perennial reaches. There is great seasonal and annual variability in flows. Most of the watershed is U.S. Bureau of Land Management or National Park land. The Amargosa River is not designated for the Municipal and Domestic Supply (MUN) beneficial use. The MUN use designation was removed in Basin Plan amendments that took effect in 2002. The rationale for removing the use included naturally high salinity and levels of toxic substances such as arsenic, and fluctuating water quantity that would make the river an unreliable supply if treatment were feasible. The perennial reaches of the Amargosa River and the associated riparian areas support a complex of rare, threatened or endangered fish and wildlife species. To Lahontan Water Board staffs knowledge, there are no salmonids in the river and there is no warm water fishery for human consumption.
QAPP Information: | The data meet the quality assurance requirements of the SWAMP QAPP.
QAPP Information Reference(s):

DECISION ID | 24362 | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)

Pollutant: | Beryllium
Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)(2010)
Revision Status | Revised
Impairment from Pollutant or Pollution: | Pollutant
Regional Board Staff Conclusion: | The LOE was incorrectly assigned to the waterbody so there is no data available for this waterbody/pollutant combination. The mapped representation of this waterbody was corrected this cycle. This decision is being decommissioned (to be retired next cycle) while a copy of it as a "Do Not List" now lives with the new mapped representation of this waterbody.
Regional Board Staff Decision Recommendation: |

Line of Evidence (LOE) for Decision ID 24362, Beryllium | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)
LOE ID: | 24897
Pollutant: | Beryllium
LOE Subgroup: | Pollutant-Sediment
Matrix: | Sediment
Fraction: | None
Beneficial Use: | Inland Saline Water Habitat
Number of Samples: | 1
Number of Exceedances: | 0
Data and Information Type: | Chemical monitoring of sediments
Data Used to Assess Water Quality: | The U.S. Geological Survey sampled sediment at this station on March 16. 2005 under the Region 6 SWAMP program. Results were reported as "bed sediment, smaller than 62.5 um, wet sieved, total digestion." The concentration of beryllium was 2 ug/g dry weight.
Data Reference: | 2007. SWAMP Data for the Amargosa Hydrologic Unit
SWAMP Data: | SWAMP
Water Quality Objective/Criterion: | There are no state or federal standards or criteria for beryllium in sediment in inland saline waters.
Objective/Criterion Reference: | Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | One station, Amargosa River below Willow Creek, was sampled.
Temporal Representation: | One sediment sample was collected on March 16, 2005.
Environmental Conditions: | The Amargosa River flows into California from Nevada and terminates in Death Valley. It is mostly ephemeral but there are perennial reaches. There is great seasonal and annual variability in flows. Most of the watershed is U.S. Bureau of Land Management or National Park land. The Amargosa River is not designated for the Municipal and Domestic Supply (MUN) beneficial use. The MUN use designation was removed in Basin Plan amendments that took effect in 2002. The rationale for removing the use included naturally high salinity and levels of toxic substances such as arsenic, and fluctuating water quantity that would make the river an unreliable supply if treatment were feasible. The perennial reaches of the Amargosa River and the associated riparian areas support a complex of rare, threatened or endangered fish and wildlife species. To Lahontan Water Board staffs knowledge, there are no salmonids in the river and there is no warm water fishery for human consumption.
QAPP Information: | The data meet the quality assurance requirements of the SWAMP QAPP.
QAPP Information Reference(s):
Line of Evidence (LOE) for Decision ID 24362, Beryllium | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)
LOE ID: | 25051
Pollutant: | Beryllium
LOE Subgroup: | Pollutant-Water
Matrix: | Water
Fraction: | Dissolved
Beneficial Use: | Inland Saline Water Habitat
Number of Samples: | 2
Number of Exceedances: | 0
Data and Information Type: | Fixed station physical/chemical (conventional plus toxic pollutants)
Data Used to Assess Water Quality: | The U.S. Geological Survey sampled this station on on March 18, 2004 and March 16, 2005 under the Region 6 SWAMP program. Concentrations of dissolved beryllium in two samples were both below the detection level.
Data Reference: | 2007. SWAMP Data for the Amargosa Hydrologic Unit
SWAMP Data: | SWAMP
Water Quality Objective/Criterion: | There are no applicable state or federal saltwater aquatic life standards or criteria for dissolved beryllium in inland saline waters.
Objective/Criterion Reference: | Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | One station, Amargosa River below Willow Creek, was sampled.
Temporal Representation: | Two samples were collected on March 18, 2004 and March 16, 2005.
Environmental Conditions: | The Amargosa River flows into California from Nevada and terminates in Death Valley. It is mostly ephemeral but there are perennial reaches. There is great seasonal and annual variability in flows. Most of the watershed is U.S. Bureau of Land Management or National Park land. The Amargosa River is not designated for the Municipal and Domestic Supply (MUN) beneficial use. The MUN use designation was removed in Basin Plan amendments that took effect in 2002. The rationale for removing the use included naturally high salinity and levels of toxic substances such as arsenic, and fluctuating water quantity that would make the river an unreliable supply if treatment were feasible. The perennial reaches of the Amargosa River and the associated riparian areas support a complex of rare, threatened or endangered fish and wildlife species. To Lahontan Water Board staffs knowledge, there are no salmonids in the river and there is no warm water fishery for human consumption.
QAPP Information: | The data meet the quality assurance requirements of the SWAMP QAPP.
QAPP Information Reference(s):
Line of Evidence (LOE) for Decision ID 24362, Beryllium | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)
LOE ID: | 25054
Pollutant: | Beryllium
LOE Subgroup: | Pollutant-Water
Matrix: | Water
Fraction: | Total
Beneficial Use: | Inland Saline Water Habitat
Number of Samples: | 2
Number of Exceedances: | 0
Data and Information Type: | Fixed station physical/chemical (conventional plus toxic pollutants)
Data Used to Assess Water Quality: | The U.S. Geological Survey sampled this station on on March 18, 2004 and March 16, 2005 under the Region 6 SWAMP program. Concentrations of total beryllium in two samples were both below the detection level.
Data Reference: | 2007. SWAMP Data for the Amargosa Hydrologic Unit
SWAMP Data: | SWAMP
Water Quality Objective/Criterion: | There are no applicable state or federal saltwater aquatic life standards or criteria for total beryllium in inland saline waters.
Objective/Criterion Reference: | Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | One station, Amargosa River below Willow Creek, was sampled.
Temporal Representation: | Two samples were collected on March 18, 2004 and March 16, 2005.
Environmental Conditions: | The Amargosa River flows into California from Nevada and terminates in Death Valley. It is mostly ephemeral but there are perennial reaches. There is great seasonal and annual variability in flows. Most of the watershed is U.S. Bureau of Land Management or National Park land. The Amargosa River is not designated for the Municipal and Domestic Supply (MUN) beneficial use. The MUN use designation was removed in Basin Plan amendments that took effect in 2002. The rationale for removing the use included naturally high salinity and levels of toxic substances such as arsenic, and fluctuating water quantity that would make the river an unreliable supply if treatment were feasible. The perennial reaches of the Amargosa River and the associated riparian areas support a complex of rare, threatened or endangered fish and wildlife species. To Lahontan Water Board staffs knowledge, there are no salmonids in the river and there is no warm water fishery for human consumption.
QAPP Information: | The data meet the quality assurance requirements of the SWAMP QAPP.
QAPP Information Reference(s):

DECISION ID | 23958 | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)

Pollutant: | Bicarbonate
Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)(2010)
Revision Status | Revised
Impairment from Pollutant or Pollution: | Pollutant
Regional Board Staff Conclusion: | The LOE was incorrectly assigned to the waterbody so there is no data available for this waterbody/pollutant combination. The mapped representation of this waterbody was corrected this cycle. This decision is being decommissioned (to be retired next cycle) while a copy of it as a "Do Not List" now lives with the new mapped representation of this waterbody.
Regional Board Staff Decision Recommendation: |

Line of Evidence (LOE) for Decision ID 23958, Bicarbonate | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)
LOE ID: | 25205
Pollutant: | Bicarbonate
LOE Subgroup: | Pollutant-Water
Matrix: | Water
Fraction: | None
Beneficial Use: | Inland Saline Water Habitat
Number of Samples: | 2
Number of Exceedances: | 0
Data and Information Type: | Fixed station physical/chemical (conventional plus toxic pollutants)
Data Used to Assess Water Quality: | The U.S. Geological Survey sampled this station on on March 18, 2004 and March 16, 2005 under the Region 6 SWAMP program. Two samples had bicarbonate concentrations of 722 and 673 mg/L.
Data Reference: | 2007. SWAMP Data for the Amargosa Hydrologic Unit
SWAMP Data: | SWAMP
Water Quality Objective/Criterion: | There are no applicable state or federal saltwater aquatic life standards or criteria for bicarbonate in inland saline waters.
Objective/Criterion Reference: | Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | One station, Amargosa River below Willow Creek, was sampled.
Temporal Representation: | Two samples were collected on March 18, 2004 and March 16, 2005.
Environmental Conditions: | The Amargosa River flows into California from Nevada and terminates in Death Valley. It is mostly ephemeral but there are perennial reaches. There is great seasonal and annual variability in flows. Most of the watershed is U.S. Bureau of Land Management or National Park land. The Amargosa River is not designated for the Municipal and Domestic Supply (MUN) beneficial use. The MUN use designation was removed in Basin Plan amendments that took effect in 2002. The rationale for removing the use included naturally high salinity and levels of toxic substances such as arsenic, and fluctuating water quantity that would make the river an unreliable supply if treatment were feasible. The perennial reaches of the Amargosa River and the associated riparian areas support a complex of rare, threatened or endangered fish and wildlife species. To Lahontan Water Board staffs knowledge, there are no salmonids in the river and there is no warm water fishery for human consumption.
QAPP Information: | The data meet the quality assurance requirements of the SWAMP QAPP.
QAPP Information Reference(s):

DECISION ID | 24058 | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)

Pollutant: | Bismuth
Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)(2010)
Revision Status | Revised
Impairment from Pollutant or Pollution: | Pollutant
Regional Board Staff Conclusion: | The LOE was incorrectly assigned to the waterbody so there is no data available for this waterbody/pollutant combination. The mapped representation of this waterbody was corrected this cycle. This decision is being decommissioned (to be retired next cycle) while a copy of it as a "Do Not List" now lives with the new mapped representation of this waterbody.
Regional Board Staff Decision Recommendation: |

Line of Evidence (LOE) for Decision ID 24058, Bismuth | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)
LOE ID: | 24898
Pollutant: | Bismuth
LOE Subgroup: | Pollutant-Sediment
Matrix: | Sediment
Fraction: | None
Beneficial Use: | Inland Saline Water Habitat
Number of Samples: | 1
Number of Exceedances: | 0
Data and Information Type: | Chemical monitoring of sediments
Data Used to Assess Water Quality: | The U.S. Geological Survey sampled sediment at this station on March 16, 2005 under the Region 6 SWAMP program. Results were reported as "bed sediment, smaller than 62.5 um, wet sieved, total digestion." The concentration of bismuth was below the detection level.
Data Reference: | 2007. SWAMP Data for the Amargosa Hydrologic Unit
SWAMP Data: | SWAMP
Water Quality Objective/Criterion: | There are no state or federal standards or criteria for bismuth in sediment in inland saline waters.
Objective/Criterion Reference: | Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | One station, Amargosa River below Willow Creek, was sampled.
Temporal Representation: | One sediment sample was collected on March 16, 2005.
Environmental Conditions: | The Amargosa River flows into California from Nevada and terminates in Death Valley. It is mostly ephemeral but there are perennial reaches. There is great seasonal and annual variability in flows. Most of the watershed is U.S. Bureau of Land Management or National Park land. The Amargosa River is not designated for the Municipal and Domestic Supply (MUN) beneficial use. The MUN use designation was removed in Basin Plan amendments that took effect in 2002. The rationale for removing the use included naturally high salinity and levels of toxic substances such as arsenic, and fluctuating water quantity that would make the river an unreliable supply if treatment were feasible. The perennial reaches of the Amargosa River and the associated riparian areas support a complex of rare, threatened or endangered fish and wildlife species. To Lahontan Water Board staffs knowledge, there are no salmonids in the river and there is no warm water fishery for human consumption.
QAPP Information: | The data meet the quality assurance requirements of the SWAMP QAPP.
QAPP Information Reference(s):

DECISION ID | 25258 | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)

Pollutant: | Boron
Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)(2010)
Revision Status | Revised
Impairment from Pollutant or Pollution: | Pollutant
Regional Board Staff Conclusion: | The LOE was incorrectly assigned to the waterbody so there is no data available for this waterbody/pollutant combination. The mapped representation of this waterbody was corrected this cycle. This decision is being decommissioned (to be retired next cycle) while a copy of it as a "Do Not List" now lives with the new mapped representation of this waterbody.
Regional Board Staff Decision Recommendation: |

Line of Evidence (LOE) for Decision ID 25258, Boron | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)
LOE ID: | 25220
Pollutant: | Boron
LOE Subgroup: | Pollutant-Water
Matrix: | Water
Fraction: | Dissolved
Beneficial Use: | Inland Saline Water Habitat
Number of Samples: | 2
Number of Exceedances: | 0
Data and Information Type: | Fixed station physical/chemical (conventional plus toxic pollutants)
Data Used to Assess Water Quality: | The U.S. Geological Survey sampled this station on on March 18, 2004 and March 16, 2005 under the Region 6 SWAMP program. Concentrations of dissolved boron in two samples were 9540 and 8930 ug/L.
Data Reference: | 2007. SWAMP Data for the Amargosa Hydrologic Unit
SWAMP Data: | SWAMP
Water Quality Objective/Criterion: | There are no applicable state or federal aquatic life standards or criteria for boron in inland saline waters.
Objective/Criterion Reference: | Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | One station, Amargosa River below Willow Creek, was sampled.
Temporal Representation: | Two samples were collected on March 18, 2004 and March 16, 2005.
Environmental Conditions: | The Amargosa River flows into California from Nevada and terminates in Death Valley. It is mostly ephemeral but there are perennial reaches. There is great seasonal and annual variability in flows. Most of the watershed is U.S. Bureau of Land Management or National Park land. The Amargosa River is not designated for the Municipal and Domestic Supply (MUN) beneficial use. The MUN use designation was removed in Basin Plan amendments that took effect in 2002. The rationale for removing the use included naturally high salinity and levels of toxic substances such as arsenic, and fluctuating water quantity that would make the river an unreliable supply if treatment were feasible. The perennial reaches of the Amargosa River and the associated riparian areas support a complex of rare, threatened or endangered fish and wildlife species. To Lahontan Water Board staffs knowledge, there are no salmonids in the river and there is no warm water fishery for human consumption.
QAPP Information: | The data meet the quality assurance requirements of the SWAMP QAPP.
QAPP Information Reference(s):

DECISION ID | 24779 | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)

Pollutant: | Cadmium
Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)(2010)
Revision Status | Revised
Impairment from Pollutant or Pollution: | Pollutant
Regional Board Staff Conclusion: | The LOE was incorrectly assigned to the waterbody so there is no data available for this waterbody/pollutant combination. The mapped representation of this waterbody was corrected this cycle. This decision is being decommissioned (to be retired next cycle) while a copy of it as a "Do Not List" now lives with the new mapped representation of this waterbody.
Regional Board Staff Decision Recommendation: |

Line of Evidence (LOE) for Decision ID 24779, Cadmium | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)
LOE ID: | 25055
Pollutant: | Cadmium
LOE Subgroup: | Pollutant-Water
Matrix: | Water
Fraction: | Total
Beneficial Use: | Inland Saline Water Habitat
Number of Samples: | 2
Number of Exceedances: | 0
Data and Information Type: | Fixed station physical/chemical (conventional plus toxic pollutants)
Data Used to Assess Water Quality: | The U.S. Geological Survey sampled this station on on March 18, 2004 and March 16, 2005 under the Region 6 SWAMP program. Concentrations of total cadmium in two samples were 0.12 and 0.17 ug/L.
Data Reference: | 2007. SWAMP Data for the Amargosa Hydrologic Unit
SWAMP Data: | SWAMP
Water Quality Objective/Criterion: | There are no applicable state or federal saltwater aquatic life standards or criteria for total cadmium in inland saline waters.
Objective/Criterion Reference: | Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | One station, Amargosa River below Willow Creek, was sampled.
Temporal Representation: | Two samples were collected on March 18, 2004 and March 16, 2005.
Environmental Conditions: | The Amargosa River flows into California from Nevada and terminates in Death Valley. It is mostly ephemeral but there are perennial reaches. There is great seasonal and annual variability in flows. Most of the watershed is U.S. Bureau of Land Management or National Park land. The Amargosa River is not designated for the Municipal and Domestic Supply (MUN) beneficial use. The MUN use designation was removed in Basin Plan amendments that took effect in 2002. The rationale for removing the use included naturally high salinity and levels of toxic substances such as arsenic, and fluctuating water quantity that would make the river an unreliable supply if treatment were feasible. The perennial reaches of the Amargosa River and the associated riparian areas support a complex of rare, threatened or endangered fish and wildlife species. To Lahontan Water Board staffs knowledge, there are no salmonids in the river and there is no warm water fishery for human consumption.
QAPP Information: | The data meet the quality assurance requirements of the SWAMP QAPP.
QAPP Information Reference(s):
Line of Evidence (LOE) for Decision ID 24779, Cadmium | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)
LOE ID: | 25056
Pollutant: | Cadmium
LOE Subgroup: | Pollutant-Water
Matrix: | Water
Fraction: | Dissolved
Beneficial Use: | Inland Saline Water Habitat
Number of Samples: | 2
Number of Exceedances: | 0
Data and Information Type: | Fixed station physical/chemical (conventional plus toxic pollutants)
Data Used to Assess Water Quality: | The U.S. Geological Survey sampled this station on on March 18, 2004 and March 16, 2005 under the Region 6 SWAMP program. Concentrations of dissolved cadmium in two samples were 0.13 and 0.14 ug/L.
Data Reference: | 2007. SWAMP Data for the Amargosa Hydrologic Unit
SWAMP Data: | SWAMP
Water Quality Objective/Criterion: | The California Toxics Rule's saltwater aquatic life standards for cadmium include an acute toxicity limit of 42 ug/L and a chronic toxicity limit of 9.3 ug/L.
Objective/Criterion Reference: | Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | One station, Amargosa River below Willow Creek, was sampled.
Temporal Representation: | Two samples were collected on March 18, 2004 and March 16, 2005.
Environmental Conditions: | The Amargosa River flows into California from Nevada and terminates in Death Valley. It is mostly ephemeral but there are perennial reaches. There is great seasonal and annual variability in flows. Most of the watershed is U.S. Bureau of Land Management or National Park land. The Amargosa River is not designated for the Municipal and Domestic Supply (MUN) beneficial use. The MUN use designation was removed in Basin Plan amendments that took effect in 2002. The rationale for removing the use included naturally high salinity and levels of toxic substances such as arsenic, and fluctuating water quantity that would make the river an unreliable supply if treatment were feasible. The perennial reaches of the Amargosa River and the associated riparian areas support a complex of rare, threatened or endangered fish and wildlife species. To Lahontan Water Board staffs knowledge, there are no salmonids in the river and there is no warm water fishery for human consumption.
QAPP Information: | The data meet the quality assurance requirements of the SWAMP QAPP.
QAPP Information Reference(s):
Line of Evidence (LOE) for Decision ID 24779, Cadmium | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)
LOE ID: | 24931
Pollutant: | Cadmium
LOE Subgroup: | Pollutant-Sediment
Matrix: | Sediment
Fraction: | None
Beneficial Use: | Inland Saline Water Habitat
Number of Samples: | 1
Number of Exceedances: | 0
Data and Information Type: | Chemical monitoring of sediments
Data Used to Assess Water Quality: | The U.S. Geological Survey sampled sediment at this station on March 16, 2005 under the Region 6 SWAMP program. Results were reported as "bed sediment, smaller than 62.5 um, wet sieved, total digestion." The concentration of cadmium was 0.1 ug/g dry weight.
Data Reference: | 2007. SWAMP Data for the Amargosa Hydrologic Unit
SWAMP Data: | SWAMP
Water Quality Objective/Criterion: | There are no state or federal standards or criteria for cadmium in sediment in inland saline waters. The Probable Effects Level for cadmium in marine and estuarine sediments is 4.21 ug/g dry weight; see MacDonald et al. (1996).
Objective/Criterion Reference: | Development and evaluation of sediment quality guidelines for Florida coastal waters. Ecotoxicology 5: 253-278
| Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | One station, Amargosa River below Willow Creek, was sampled.
Temporal Representation: | One sediment sample was collected on March 16, 2005.
Environmental Conditions: | The Amargosa River flows into California from Nevada and terminates in Death Valley. It is mostly ephemeral but there are perennial reaches. There is great seasonal and annual variability in flows. Most of the watershed is U.S. Bureau of Land Management or National Park land. The Amargosa River is not designated for the Municipal and Domestic Supply (MUN) beneficial use. The MUN use designation was removed in Basin Plan amendments that took effect in 2002. The rationale for removing the use included naturally high salinity and levels of toxic substances such as arsenic, and fluctuating water quantity that would make the river an unreliable supply if treatment were feasible. The perennial reaches of the Amargosa River and the associated riparian areas support a complex of rare, threatened or endangered fish and wildlife species. To Lahontan Water Board staffs knowledge, there are no salmonids in the river and there is no warm water fishery for human consumption.
QAPP Information: | The data meet the quality assurance requirements of the SWAMP QAPP.
QAPP Information Reference(s):

DECISION ID | 25334 | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)

Pollutant: | Caffeine
Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)(2010)
Revision Status | Revised
Impairment from Pollutant or Pollution: | Pollutant
Regional Board Staff Conclusion: | The LOE was incorrectly assigned to the waterbody so there is no data available for this waterbody/pollutant combination. The mapped representation of this waterbody was corrected this cycle. This decision is being decommissioned (to be retired next cycle) while a copy of it as a "Do Not List" now lives with the new mapped representation of this waterbody.
Regional Board Staff Decision Recommendation: |

Line of Evidence (LOE) for Decision ID 25334, Caffeine | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)
LOE ID: | 24920
Pollutant: | Caffeine
LOE Subgroup: | Pollutant-Water
Matrix: | Water
Fraction: | None
Beneficial Use: | Inland Saline Water Habitat
Number of Samples: | 1
Number of Exceedances: | 0
Data and Information Type: | Fixed station physical/chemical (conventional plus toxic pollutants)
Data Used to Assess Water Quality: | The U.S. Geological Survey sample this station on March 16 2005 under the Region 6 SWAMP program. The concentration of caffeine in one sample was below the detection level.
Data Reference: | 2007. SWAMP Data for the Amargosa Hydrologic Unit
SWAMP Data: | SWAMP
Water Quality Objective/Criterion: | There are no state or federal standards or criteria for caffeine in inland saline waters.
Objective/Criterion Reference: | Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | One station, Amargosa River below Willow Creek, was sampled.
Temporal Representation: | One sediment sample was collected on March 16, 2005.
Environmental Conditions: | The Amargosa River flows into California from Nevada and terminates in Death Valley. It is mostly ephemeral but there are perennial reaches. There is great seasonal and annual variability in flows. Most of the watershed is U.S. Bureau of Land Management or National Park land. The Amargosa River is not designated for the Municipal and Domestic Supply (MUN) beneficial use. The MUN use designation was removed in Basin Plan amendments that took effect in 2002. The rationale for removing the use included naturally high salinity and levels of toxic substances such as arsenic, and fluctuating water quantity that would make the river an unreliable supply if treatment were feasible. The perennial reaches of the Amargosa River and the associated riparian areas support a complex of rare, threatened or endangered fish and wildlife species. To Lahontan Water Board staffs knowledge, there are no salmonids in the river and there is no warm water fishery for human consumption.
QAPP Information: | The data meet the quality assurance requirements of the SWAMP QAPP.
QAPP Information Reference(s):

DECISION ID | 24363 | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)

Pollutant: | Calcium
Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)(2010)
Revision Status | Revised
Impairment from Pollutant or Pollution: | Pollutant
Regional Board Staff Conclusion: | The LOE was incorrectly assigned to the waterbody so there is no data available for this waterbody/pollutant combination. The mapped representation of this waterbody was corrected this cycle. This decision is being decommissioned (to be retired next cycle) while a copy of it as a "Do Not List" now lives with the new mapped representation of this waterbody.
Regional Board Staff Decision Recommendation: |

Line of Evidence (LOE) for Decision ID 24363, Calcium | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)
LOE ID: | 25198
Pollutant: | Calcium
LOE Subgroup: | Pollutant-Water
Matrix: | Water
Fraction: | Dissolved
Beneficial Use: | Inland Saline Water Habitat
Number of Samples: | 2
Number of Exceedances: | 0
Data and Information Type: | Fixed station physical/chemical (conventional plus toxic pollutants)
Data Used to Assess Water Quality: | The U.S. Geological Survey sampled this station on on March 18, 2004 and March 16, 2005 under the Region 6 SWAMP program. Two samples had dissolved calcium concentrations of 37.5 and 62.1 mg/L.
Data Reference: | 2007. SWAMP Data for the Amargosa Hydrologic Unit
SWAMP Data: | SWAMP
Water Quality Objective/Criterion: | There are no applicable state or federal standards or criteria for dissolved calcium in inland saline waters.
Objective/Criterion Reference: | Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | One station, Amargosa River below Willow Creek, was sampled.
Temporal Representation: | Two samples were collected on March 18, 2004 and March 16, 2005.
Environmental Conditions: | The Amargosa River flows into California from Nevada and terminates in Death Valley. It is mostly ephemeral but there are perennial reaches. There is great seasonal and annual variability in flows. Most of the watershed is U.S. Bureau of Land Management or National Park land. The Amargosa River is not designated for the Municipal and Domestic Supply (MUN) beneficial use. The MUN use designation was removed in Basin Plan amendments that took effect in 2002. The rationale for removing the use included naturally high salinity and levels of toxic substances such as arsenic, and fluctuating water quantity that would make the river an unreliable supply if treatment were feasible. The perennial reaches of the Amargosa River and the associated riparian areas support a complex of rare, threatened or endangered fish and wildlife species. To Lahontan Water Board staffs knowledge, there are no salmonids in the river and there is no warm water fishery for human consumption.
QAPP Information: | The data meet the quality assurance requirements of the SWAMP QAPP.
QAPP Information Reference(s):
Line of Evidence (LOE) for Decision ID 24363, Calcium | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)
LOE ID: | 25199
Pollutant: | Calcium
LOE Subgroup: | Pollutant-Water
Matrix: | Water
Fraction: | Total
Beneficial Use: | Inland Saline Water Habitat
Number of Samples: | 2
Number of Exceedances: | 0
Data and Information Type: | Fixed station physical/chemical (conventional plus toxic pollutants)
Data Used to Assess Water Quality: | The U.S. Geological Survey sampled this station on on March 18, 2004 and March 16, 2005 under the Region 6 SWAMP program. Two samples had total calcium concentrations of 47.7 and 65.1 mg/L.
Data Reference: | 2007. SWAMP Data for the Amargosa Hydrologic Unit
SWAMP Data: | SWAMP
Water Quality Objective/Criterion: | There are no applicable state or federal standards or criteria for total calcium in inland saline waters.
Objective/Criterion Reference: | Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | One station, Amargosa River below Willow Creek, was sampled.
Temporal Representation: | Two samples were collected on March 18, 2004 and March 16, 2005.
Environmental Conditions: | The Amargosa River flows into California from Nevada and terminates in Death Valley. It is mostly ephemeral but there are perennial reaches. There is great seasonal and annual variability in flows. Most of the watershed is U.S. Bureau of Land Management or National Park land. The Amargosa River is not designated for the Municipal and Domestic Supply (MUN) beneficial use. The MUN use designation was removed in Basin Plan amendments that took effect in 2002. The rationale for removing the use included naturally high salinity and levels of toxic substances such as arsenic, and fluctuating water quantity that would make the river an unreliable supply if treatment were feasible. The perennial reaches of the Amargosa River and the associated riparian areas support a complex of rare, threatened or endangered fish and wildlife species. To Lahontan Water Board staffs knowledge, there are no salmonids in the river and there is no warm water fishery for human consumption.
QAPP Information: | The data meet the quality assurance requirements of the SWAMP QAPP.
QAPP Information Reference(s):
Line of Evidence (LOE) for Decision ID 24363, Calcium | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)
LOE ID: | 24925
Pollutant: | Calcium
LOE Subgroup: | Pollutant-Sediment
Matrix: | Sediment
Fraction: | None
Beneficial Use: | Inland Saline Water Habitat
Number of Samples: | 1
Number of Exceedances: | 0
Data and Information Type: | Chemical monitoring of sediments
Data Used to Assess Water Quality: | The U.S. Geological Survey sampled sediment at this station on March 16, 2005 under the Region 6 SWAMP program. Results were reported as "bed sediment, smaller than 62.5 um, wet sieved, total digestion." The concentration of calcium was 3.5 percent dry weight.
Data Reference: | 2007. SWAMP Data for the Amargosa Hydrologic Unit
SWAMP Data: | SWAMP
Water Quality Objective/Criterion: | There are no state or federal standards or criteria for calcium in sediment in inland saline waters.
Objective/Criterion Reference: | Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | One station, Amargosa River below Willow Creek, was sampled.
Temporal Representation: | One sediment sample was collected on March 16, 2005.
Environmental Conditions: | The Amargosa River flows into California from Nevada and terminates in Death Valley. It is mostly ephemeral but there are perennial reaches. There is great seasonal and annual variability in flows. Most of the watershed is U.S. Bureau of Land Management or National Park land. The Amargosa River is not designated for the Municipal and Domestic Supply (MUN) beneficial use. The MUN use designation was removed in Basin Plan amendments that took effect in 2002. The rationale for removing the use included naturally high salinity and levels of toxic substances such as arsenic, and fluctuating water quantity that would make the river an unreliable supply if treatment were feasible. The perennial reaches of the Amargosa River and the associated riparian areas support a complex of rare, threatened or endangered fish and wildlife species. To Lahontan Water Board staffs knowledge, there are no salmonids in the river and there is no warm water fishery for human consumption.
QAPP Information: | The data meet the quality assurance requirements of the SWAMP QAPP.
QAPP Information Reference(s):

DECISION ID | 24603 | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)

Pollutant: | Carbon (inorganic)
Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)(2010)
Revision Status | Revised
Impairment from Pollutant or Pollution: | Pollutant
Regional Board Staff Conclusion: | The LOE was incorrectly assigned to the waterbody so there is no data available for this waterbody/pollutant combination. The mapped representation of this waterbody was corrected this cycle. This decision is being decommissioned (to be retired next cycle) while a copy of it as a "Do Not List" now lives with the new mapped representation of this waterbody.
Regional Board Staff Decision Recommendation: |

Line of Evidence (LOE) for Decision ID 24603, Carbon (inorganic) | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)
LOE ID: | 24895
Pollutant: | Carbon (inorganic)
LOE Subgroup: | Pollutant-Sediment
Matrix: | Sediment
Fraction: | None
Beneficial Use: | Inland Saline Water Habitat
Number of Samples: | 1
Number of Exceedances: | 0
Data and Information Type: | Chemical monitoring of sediments
Data Used to Assess Water Quality: | The U.S. Geological Survey sampled sediment at this station on March 16, 2005 under the Region 6 SWAMP program. Results were reported as "bed sediment, smaller than 62.5 um, wet sieved, total digestion." The concentration of carbon (inorganic) was 0.93 percent dry weight.
Data Reference: | 2007. SWAMP Data for the Amargosa Hydrologic Unit
SWAMP Data: | SWAMP
Water Quality Objective/Criterion: | There are no state or federal standards or criteria for carbon in sediment in inland saline waters.
Objective/Criterion Reference: | Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | One station, Amargosa River below Willow Creek, was sampled.
Temporal Representation: | One sediment sample was collected on March 16, 2005.
Environmental Conditions: | The Amargosa River flows into California from Nevada and terminates in Death Valley. It is mostly ephemeral but there are perennial reaches. There is great seasonal and annual variability in flows. Most of the watershed is U.S. Bureau of Land Management or National Park land. The Amargosa River is not designated for the Municipal and Domestic Supply (MUN) beneficial use. The MUN use designation was removed in Basin Plan amendments that took effect in 2002. The rationale for removing the use included naturally high salinity and levels of toxic substances such as arsenic, and fluctuating water quantity that would make the river an unreliable supply if treatment were feasible. The perennial reaches of the Amargosa River and the associated riparian areas support a complex of rare, threatened or endangered fish and wildlife species. To Lahontan Water Board staffs knowledge, there are no salmonids in the river and there is no warm water fishery for human consumption.
QAPP Information: | The data meet the quality assurance requirements of the SWAMP QAPP.
QAPP Information Reference(s):

DECISION ID | 24395 | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)

Pollutant: | Carbon (organic + inorganic)
Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)(2010)
Revision Status | Revised
Impairment from Pollutant or Pollution: | Pollutant
Regional Board Staff Conclusion: | The LOE was incorrectly assigned to the waterbody so there is no data available for this waterbody/pollutant combination. The mapped representation of this waterbody was corrected this cycle. This decision is being decommissioned (to be retired next cycle) while a copy of it as a "Do Not List" now lives with the new mapped representation of this waterbody.
Regional Board Staff Decision Recommendation: |

Line of Evidence (LOE) for Decision ID 24395, Carbon (organic + inorganic) | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)
LOE ID: | 24894
Pollutant: | Carbon (organic + inorganic)
LOE Subgroup: | Pollutant-Sediment
Matrix: | Sediment
Fraction: | None
Beneficial Use: | Inland Saline Water Habitat
Number of Samples: | 1
Number of Exceedances: | 0
Data and Information Type: | Chemical monitoring of sediments
Data Used to Assess Water Quality: | The U.S. Geological Survey sampled sediment at this station on March 16, 2005 under the Region 6 SWAMP program. Results were reported as "bed sediment, smaller than 62.5 um, wet sieved, total digestion." The concentration of carbon (inorganic + organic) was 1 percent dry weight.
Data Reference: | 2007. SWAMP Data for the Amargosa Hydrologic Unit
SWAMP Data: | SWAMP
Water Quality Objective/Criterion: | There are no state or federal standards or criteria for carbon in sediment in inland saline waters.
Objective/Criterion Reference: | Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | One station, Amargosa River below Willow Creek, was sampled.
Temporal Representation: | One sediment sample was collected on March 16, 2005.
Environmental Conditions: | The Amargosa River flows into California from Nevada and terminates in Death Valley. It is mostly ephemeral but there are perennial reaches. There is great seasonal and annual variability in flows. Most of the watershed is U.S. Bureau of Land Management or National Park land. The Amargosa River is not designated for the Municipal and Domestic Supply (MUN) beneficial use. The MUN use designation was removed in Basin Plan amendments that took effect in 2002. The rationale for removing the use included naturally high salinity and levels of toxic substances such as arsenic, and fluctuating water quantity that would make the river an unreliable supply if treatment were feasible. The perennial reaches of the Amargosa River and the associated riparian areas support a complex of rare, threatened or endangered fish and wildlife species. To Lahontan Water Board staffs knowledge, there are no salmonids in the river and there is no warm water fishery for human consumption.
QAPP Information: | The data meet the quality assurance requirements of the SWAMP QAPP.
QAPP Information Reference(s):

DECISION ID | 24405 | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)

Pollutant: | Carbon (organic)
Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)(2010)
Revision Status | Revised
Impairment from Pollutant or Pollution: | Pollutant
Regional Board Staff Conclusion: | The LOE was incorrectly assigned to the waterbody so there is no data available for this waterbody/pollutant combination. The mapped representation of this waterbody was corrected this cycle. This decision is being decommissioned (to be retired next cycle) while a copy of it as a "Do Not List" now lives with the new mapped representation of this waterbody.
Regional Board Staff Decision Recommendation: |

Line of Evidence (LOE) for Decision ID 24405, Carbon (organic) | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)
LOE ID: | 25187
Pollutant: | Carbon (organic)
LOE Subgroup: | Pollutant-Sediment
Matrix: | Sediment
Fraction: | None
Beneficial Use: | Inland Saline Water Habitat
Number of Samples: | 1
Number of Exceedances: | 0
Data and Information Type: | Chemical monitoring of sediments
Data Used to Assess Water Quality: | The U.S. Geological Survey sampled sediment at this station on March 16, 2005 under the Region 6 SWAMP program. Results were reported as "bed sediment, smaller than 62.5 um, wet sieved, total digestion." The concentration of carbon (organic) was 0.09 percent dry weight.
Data Reference: | 2007. SWAMP Data for the Amargosa Hydrologic Unit
SWAMP Data: | SWAMP
Water Quality Objective/Criterion: | There are no state or federal standards or criteria for organic carbon in sediment in inland saline waters.
Objective/Criterion Reference: | Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | One station, Amargosa River below Willow Creek, was sampled.
Temporal Representation: | One sediment sample was collected on March 16, 2005.
Environmental Conditions: | The Amargosa River flows into California from Nevada and terminates in Death Valley. It is mostly ephemeral but there are perennial reaches. There is great seasonal and annual variability in flows. Most of the watershed is U.S. Bureau of Land Management or National Park land. The Amargosa River is not designated for the Municipal and Domestic Supply (MUN) beneficial use. The MUN use designation was removed in Basin Plan amendments that took effect in 2002. The rationale for removing the use included naturally high salinity and levels of toxic substances such as arsenic, and fluctuating water quantity that would make the river an unreliable supply if treatment were feasible. The perennial reaches of the Amargosa River and the associated riparian areas support a complex of rare, threatened or endangered fish and wildlife species. To Lahontan Water Board staffs knowledge, there are no salmonids in the river and there is no warm water fishery for human consumption.
QAPP Information: | The data meet the quality assurance requirements of the SWAMP QAPP.
QAPP Information Reference(s):

DECISION ID | 23778 | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)

Pollutant: | Carbonate
Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)(2010)
Revision Status | Revised
Impairment from Pollutant or Pollution: | Pollutant
Regional Board Staff Conclusion: | The LOE was incorrectly assigned to the waterbody so there is no data available for this waterbody/pollutant combination. The mapped representation of this waterbody was corrected this cycle. This decision is being decommissioned (to be retired next cycle) while a copy of it as a "Do Not List" now lives with the new mapped representation of this waterbody.
Regional Board Staff Decision Recommendation: |

Line of Evidence (LOE) for Decision ID 23778, Carbonate | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)
LOE ID: | 25206
Pollutant: | Carbonate
LOE Subgroup: | Pollutant-Water
Matrix: | Water
Fraction: | None
Beneficial Use: | Inland Saline Water Habitat
Number of Samples: | 2
Number of Exceedances: | 0
Data and Information Type: | Fixed station physical/chemical (conventional plus toxic pollutants)
Data Used to Assess Water Quality: | The U.S. Geological Survey sampled this station on on March 18, 2004 and March 16, 2005 under the Region 6 SWAMP program. Two samples had carbonate concentrations of 23 and 48 mg/L.
Data Reference: | 2007. SWAMP Data for the Amargosa Hydrologic Unit
SWAMP Data: | SWAMP
Water Quality Objective/Criterion: | There are no applicable state or federal saltwater aquatic life standards or criteria for carbonate in inland saline waters.
Objective/Criterion Reference: | Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | One station, Amargosa River below Willow Creek, was sampled.
Temporal Representation: | Two samples were collected on March 18, 2004 and March 16, 2005.
Environmental Conditions: | The Amargosa River flows into California from Nevada and terminates in Death Valley. It is mostly ephemeral but there are perennial reaches. There is great seasonal and annual variability in flows. Most of the watershed is U.S. Bureau of Land Management or National Park land. The Amargosa River is not designated for the Municipal and Domestic Supply (MUN) beneficial use. The MUN use designation was removed in Basin Plan amendments that took effect in 2002. The rationale for removing the use included naturally high salinity and levels of toxic substances such as arsenic, and fluctuating water quantity that would make the river an unreliable supply if treatment were feasible. The perennial reaches of the Amargosa River and the associated riparian areas support a complex of rare, threatened or endangered fish and wildlife species. To Lahontan Water Board staffs knowledge, there are no salmonids in the river and there is no warm water fishery for human consumption.
QAPP Information: | The data meet the quality assurance requirements of the SWAMP QAPP.
QAPP Information Reference(s):

DECISION ID | 25374 | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)

Pollutant: | Cerium
Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)(2010)
Revision Status | Revised
Impairment from Pollutant or Pollution: | Pollutant
Regional Board Staff Conclusion: | The LOE was incorrectly assigned to the waterbody so there is no data available for this waterbody/pollutant combination. The mapped representation of this waterbody was corrected this cycle. This decision is being decommissioned (to be retired next cycle) while a copy of it as a "Do Not List" now lives with the new mapped representation of this waterbody.
Regional Board Staff Decision Recommendation: |

Line of Evidence (LOE) for Decision ID 25374, Cerium | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)
LOE ID: | 24899
Pollutant: | Cerium
LOE Subgroup: | Pollutant-Sediment
Matrix: | Sediment
Fraction: | None
Beneficial Use: | Inland Saline Water Habitat
Number of Samples: | 1
Number of Exceedances: | 0
Data and Information Type: | Chemical monitoring of sediments
Data Used to Assess Water Quality: | The U.S. Geological Survey sampled sediment at this station on March 16, 2005 under the Region 6 SWAMP program. Results were reported as "bed sediment, smaller than 62.5 um, wet sieved, total digestion." The concentration of cerium was 76 ug/g dry weight.
Data Reference: | 2007. SWAMP Data for the Amargosa Hydrologic Unit
SWAMP Data: | SWAMP
Water Quality Objective/Criterion: | There are no state or federal standards or criteria for cerium in sediment in inland saline waters.
Objective/Criterion Reference: | Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | One station, Amargosa River below Willow Creek, was sampled.
Temporal Representation: | One sediment sample was collected on March 16, 2005.
Environmental Conditions: | The Amargosa River flows into California from Nevada and terminates in Death Valley. It is mostly ephemeral but there are perennial reaches. There is great seasonal and annual variability in flows. Most of the watershed is U.S. Bureau of Land Management or National Park land. The Amargosa River is not designated for the Municipal and Domestic Supply (MUN) beneficial use. The MUN use designation was removed in Basin Plan amendments that took effect in 2002. The rationale for removing the use included naturally high salinity and levels of toxic substances such as arsenic, and fluctuating water quantity that would make the river an unreliable supply if treatment were feasible. The perennial reaches of the Amargosa River and the associated riparian areas support a complex of rare, threatened or endangered fish and wildlife species. To Lahontan Water Board staffs knowledge, there are no salmonids in the river and there is no warm water fishery for human consumption.
QAPP Information: | The data meet the quality assurance requirements of the SWAMP QAPP.
QAPP Information Reference(s):

DECISION ID | 23792 | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)

Pollutant: | Chloride
Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)(2010)
Revision Status | Revised
Impairment from Pollutant or Pollution: | Pollutant
Regional Board Staff Conclusion: | The LOE was incorrectly assigned to the waterbody so there is no data available for this waterbody/pollutant combination. The mapped representation of this waterbody was corrected this cycle. This decision is being decommissioned (to be retired next cycle) while a copy of it as a "Do Not List" now lives with the new mapped representation of this waterbody.
Regional Board Staff Decision Recommendation: |

Line of Evidence (LOE) for Decision ID 23792, Chloride | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)
LOE ID: | 25207
Pollutant: | Chloride
LOE Subgroup: | Pollutant-Water
Matrix: | Water
Fraction: | Dissolved
Beneficial Use: | Inland Saline Water Habitat
Number of Samples: | 2
Number of Exceedances: | 0
Data and Information Type: | Fixed station physical/chemical (conventional plus toxic pollutants)
Data Used to Assess Water Quality: | The U.S. Geological Survey sampled this station on March 18, 2004 and March 16, 2005 under the Region 6 SWAMP program. Two samples had dissolved chloride concentrations of 427 and 337 mg/L.
Data Reference: | 2007. SWAMP Data for the Amargosa Hydrologic Unit
SWAMP Data: | SWAMP
Water Quality Objective/Criterion: | There are no applicable state or federal saltwater aquatic life standards or criteria for chloride in inland saline waters.
Objective/Criterion Reference: | Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | One station, Amargosa River below Willow Creek, was sampled.
Temporal Representation: | Two samples were collected on March 18, 2004 and March 16, 2005.
Environmental Conditions: | The Amargosa River flows into California from Nevada and terminates in Death Valley. It is mostly ephemeral but there are perennial reaches. There is great seasonal and annual variability in flows. Most of the watershed is U.S. Bureau of Land Management or National Park land. The Amargosa River is not designated for the Municipal and Domestic Supply (MUN) beneficial use. The MUN use designation was removed in Basin Plan amendments that took effect in 2002. The rationale for removing the use included naturally high salinity and levels of toxic substances such as arsenic, and fluctuating water quantity that would make the river an unreliable supply if treatment were feasible. The perennial reaches of the Amargosa River and the associated riparian areas support a complex of rare, threatened or endangered fish and wildlife species. To Lahontan Water Board staffs knowledge, there are no salmonids in the river and there is no warm water fishery for human consumption.
QAPP Information: | The data meet the quality assurance requirements of the SWAMP QAPP.
QAPP Information Reference(s):

DECISION ID | 24780 | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)

Pollutant: | Chromium (total)
Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)(2010)
Revision Status | Revised
Impairment from Pollutant or Pollution: | Pollutant
Regional Board Staff Conclusion: | The LOE was incorrectly assigned to the waterbody so there is no data available for this waterbody/pollutant combination. The mapped representation of this waterbody was corrected this cycle. This decision is being decommissioned (to be retired next cycle) while a copy of it as a "Do Not List" now lives with the new mapped representation of this waterbody.
Regional Board Staff Decision Recommendation: |

Line of Evidence (LOE) for Decision ID 24780, Chromium (total) | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)
LOE ID: | 25058
Pollutant: | Chromium (total)
LOE Subgroup: | Pollutant-Water
Matrix: | Water
Fraction: | Total
Beneficial Use: | Inland Saline Water Habitat
Number of Samples: | 2
Number of Exceedances: | 0
Data and Information Type: | Fixed station physical/chemical (conventional plus toxic pollutants)
Data Used to Assess Water Quality: | The U.S. Geological Survey sampled this station on on March 18, 2004 and March 16, 2005 under the Region 6 SWAMP program. Concentrations of total chromium in both of two samples were estimated values.
Data Reference: | 2007. SWAMP Data for the Amargosa Hydrologic Unit
SWAMP Data: | SWAMP
Water Quality Objective/Criterion: | There are no applicable state or federal saltwater aquatic life standards or criteria for total chromium in inland saline waters.
Objective/Criterion Reference: | Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | One station, Amargosa River below Willow Creek, was sampled.
Temporal Representation: | Two samples were collected on March 18, 2004 and March 16, 2005.
Environmental Conditions: | The Amargosa River flows into California from Nevada and terminates in Death Valley. It is mostly ephemeral but there are perennial reaches. There is great seasonal and annual variability in flows. Most of the watershed is U.S. Bureau of Land Management or National Park land. The Amargosa River is not designated for the Municipal and Domestic Supply (MUN) beneficial use. The MUN use designation was removed in Basin Plan amendments that took effect in 2002. The rationale for removing the use included naturally high salinity and levels of toxic substances such as arsenic, and fluctuating water quantity that would make the river an unreliable supply if treatment were feasible. The perennial reaches of the Amargosa River and the associated riparian areas support a complex of rare, threatened or endangered fish and wildlife species. To Lahontan Water Board staffs knowledge, there are no salmonids in the river and there is no warm water fishery for human consumption.
QAPP Information: | The data meet the quality assurance requirements of the SWAMP QAPP.
QAPP Information Reference(s):
Line of Evidence (LOE) for Decision ID 24780, Chromium (total) | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)
LOE ID: | 25057
Pollutant: | Chromium (total)
LOE Subgroup: | Pollutant-Water
Matrix: | Water
Fraction: | Dissolved
Beneficial Use: | Inland Saline Water Habitat
Number of Samples: | 2
Number of Exceedances: | 0
Data and Information Type: | Fixed station physical/chemical (conventional plus toxic pollutants)
Data Used to Assess Water Quality: | The U.S. Geological Survey sampled this station on on March 18, 2004 and March 16, 2005 under the Region 6 SWAMP program. One of two samples for dissolved chromium was below the detection level and the other was an estimated value.
Data Reference: | 2007. SWAMP Data for the Amargosa Hydrologic Unit
SWAMP Data: | SWAMP
Water Quality Objective/Criterion: | The California Toxics Rule's saltwater aquatic life standards for chromium include an acute toxicity limit of 1100 ug/L and a chronic toxicity limit of 50 ug/L.
Objective/Criterion Reference: | Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | One station, Amargosa River below Willow Creek, was sampled.
Temporal Representation: | Two samples were collected on March 18, 2004 and March 16, 2005.
Environmental Conditions: | The Amargosa River flows into California from Nevada and terminates in Death Valley. It is mostly ephemeral but there are perennial reaches. There is great seasonal and annual variability in flows. Most of the watershed is U.S. Bureau of Land Management or National Park land. The Amargosa River is not designated for the Municipal and Domestic Supply (MUN) beneficial use. The MUN use designation was removed in Basin Plan amendments that took effect in 2002. The rationale for removing the use included naturally high salinity and levels of toxic substances such as arsenic, and fluctuating water quantity that would make the river an unreliable supply if treatment were feasible. The perennial reaches of the Amargosa River and the associated riparian areas support a complex of rare, threatened or endangered fish and wildlife species. To Lahontan Water Board staffs knowledge, there are no salmonids in the river and there is no warm water fishery for human consumption.
QAPP Information: | The data meet the quality assurance requirements of the SWAMP QAPP.
QAPP Information Reference(s):
Line of Evidence (LOE) for Decision ID 24780, Chromium (total) | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)
LOE ID: | 24932
Pollutant: | Chromium (total)
LOE Subgroup: | Pollutant-Sediment
Matrix: | Sediment
Fraction: | None
Beneficial Use: | Inland Saline Water Habitat
Number of Samples: | 1
Number of Exceedances: | 0
Data and Information Type: | Chemical monitoring of sediments
Data Used to Assess Water Quality: | The U.S. Geological Survey sampled sediment at this station on March 16, 2005 under the Region 6 SWAMP program. Results were reported as "bed sediment, smaller than 62.5 um, wet sieved, total digestion." The concentration of chromium was 21 ug/g dry weight. (The SWAMP data do not distinguish between trivalent and hexavalent chromium.)
Data Reference: | 2007. SWAMP Data for the Amargosa Hydrologic Unit
SWAMP Data: | SWAMP
Water Quality Objective/Criterion: | There are no state or federal standards or criteria for arsenic in sediment in inland saline waters. The Effects Range-Median for chromium in marine and estuarine sediments is 370 ug/g dry weight; see Long et al. (1995).
Objective/Criterion Reference: | Incidence of adverse biological effects within ranges of chemical concentrations in marine and estuary sediments. Environmental Management. 19, (1): 81-97
| Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | One station, Amargosa River below Willow Creek, was sampled.
Temporal Representation: | One sediment sample was collected on March 16, 2005.
Environmental Conditions: | The Amargosa River flows into California from Nevada and terminates in Death Valley. It is mostly ephemeral but there are perennial reaches. There is great seasonal and annual variability in flows. Most of the watershed is U.S. Bureau of Land Management or National Park land. The Amargosa River is not designated for the Municipal and Domestic Supply (MUN) beneficial use. The MUN use designation was removed in Basin Plan amendments that took effect in 2002. The rationale for removing the use included naturally high salinity and levels of toxic substances such as arsenic, and fluctuating water quantity that would make the river an unreliable supply if treatment were feasible. The perennial reaches of the Amargosa River and the associated riparian areas support a complex of rare, threatened or endangered fish and wildlife species. To Lahontan Water Board staffs knowledge, there are no salmonids in the river and there is no warm water fishery for human consumption.
QAPP Information: | The data meet the quality assurance requirements of the SWAMP QAPP.
QAPP Information Reference(s):

DECISION ID | 24373 | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)

Pollutant: | Cobalt
Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)(2010)
Revision Status | Revised
Impairment from Pollutant or Pollution: | Pollutant
Regional Board Staff Conclusion: |
Regional Board Staff Decision Recommendation: |

Line of Evidence (LOE) for Decision ID 24373, Cobalt | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)
LOE ID: | 24900
Pollutant: | Cobalt
LOE Subgroup: | Pollutant-Sediment
Matrix: | Sediment
Fraction: | None
Beneficial Use: | Inland Saline Water Habitat
Number of Samples: | 1
Number of Exceedances: | 0
Data and Information Type: | Chemical monitoring of sediments
Data Used to Assess Water Quality: | The U.S. Geological Survey sampled sediment at this station on March 16, 2005 under the Region 6 SWAMP program. Results were reported as "bed sediment, smaller than 62.5 um, wet sieved, total digestion." The concentration of cobalt was 6 ug/g dry weight.
Data Reference: | 2007. SWAMP Data for the Amargosa Hydrologic Unit
SWAMP Data: | SWAMP
Water Quality Objective/Criterion: | There are no state or federal standards or criteria for cobalt in sediment in inland saline waters.
Objective/Criterion Reference: | Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | One station, Amargosa River below Willow Creek, was sampled.
Temporal Representation: | One sediment sample was collected on March 16, 2005.
Environmental Conditions: | The Amargosa River flows into California from Nevada and terminates in Death Valley. It is mostly ephemeral but there are perennial reaches. There is great seasonal and annual variability in flows. Most of the watershed is U.S. Bureau of Land Management or National Park land. The Amargosa River is not designated for the Municipal and Domestic Supply (MUN) beneficial use. The MUN use designation was removed in Basin Plan amendments that took effect in 2002. The rationale for removing the use included naturally high salinity and levels of toxic substances such as arsenic, and fluctuating water quantity that would make the river an unreliable supply if treatment were feasible. The perennial reaches of the Amargosa River and the associated riparian areas support a complex of rare, threatened or endangered fish and wildlife species. To Lahontan Water Board staffs knowledge, there are no salmonids in the river and there is no warm water fishery for human consumption.
QAPP Information: | The data meet the quality assurance requirements of the SWAMP QAPP.
QAPP Information Reference(s):
Line of Evidence (LOE) for Decision ID 24373, Cobalt | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)
LOE ID: | 25063
Pollutant: | Cobalt
LOE Subgroup: | Pollutant-Water
Matrix: | Water
Fraction: | Dissolved
Beneficial Use: | Inland Saline Water Habitat
Number of Samples: | 2
Number of Exceedances: | 0
Data and Information Type: | Fixed station physical/chemical (conventional plus toxic pollutants)
Data Used to Assess Water Quality: | The U.S. Geological Survey sampled this station on on March 18, 2004 and March 16, 2005 under the Region 6 SWAMP program. Concentrations of dissolved cobalt in two samples were 0.24 and 0.37 ug/L.
Data Reference: | 2007. SWAMP Data for the Amargosa Hydrologic Unit
SWAMP Data: | SWAMP
Water Quality Objective/Criterion: | There are no applicable state or federal saltwater aquatic life standards or criteria for dissolved cobalt in inland saline waters.
Objective/Criterion Reference: | Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | One station, Amargosa River below Willow Creek, was sampled.
Temporal Representation: | Two samples were collected on March 18, 2004 and March 16, 2005.
Environmental Conditions: | The Amargosa River flows into California from Nevada and terminates in Death Valley. It is mostly ephemeral but there are perennial reaches. There is great seasonal and annual variability in flows. Most of the watershed is U.S. Bureau of Land Management or National Park land. The Amargosa River is not designated for the Municipal and Domestic Supply (MUN) beneficial use. The MUN use designation was removed in Basin Plan amendments that took effect in 2002. The rationale for removing the use included naturally high salinity and levels of toxic substances such as arsenic, and fluctuating water quantity that would make the river an unreliable supply if treatment were feasible. The perennial reaches of the Amargosa River and the associated riparian areas support a complex of rare, threatened or endangered fish and wildlife species. To Lahontan Water Board staffs knowledge, there are no salmonids in the river and there is no warm water fishery for human consumption.
QAPP Information: | The data meet the quality assurance requirements of the SWAMP QAPP.
QAPP Information Reference(s):
Line of Evidence (LOE) for Decision ID 24373, Cobalt | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)
LOE ID: | 25062
Pollutant: | Cobalt
LOE Subgroup: | Pollutant-Water
Matrix: | Water
Fraction: | Total
Beneficial Use: | Inland Saline Water Habitat
Number of Samples: | 2
Number of Exceedances: | 0
Data and Information Type: | Fixed station physical/chemical (conventional plus toxic pollutants)
Data Used to Assess Water Quality: | The U.S. Geological Survey sampled this station on on March 18, 2004 and March 16, 2005 under the Region 6 SWAMP program. Concentrations of total cobalt in two samples were 0.56 and 0.8 ug/L.
Data Reference: | 2007. SWAMP Data for the Amargosa Hydrologic Unit
SWAMP Data: | SWAMP
Water Quality Objective/Criterion: | There are no applicable state or federal saltwater aquatic life standards or criteria for total cobalt in inland saline waters.
Objective/Criterion Reference: | Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | One station, Amargosa River below Willow Creek, was sampled.
Temporal Representation: | Two samples were collected on March 18, 2004 and March 16, 2005.
Environmental Conditions: | The Amargosa River flows into California from Nevada and terminates in Death Valley. It is mostly ephemeral but there are perennial reaches. There is great seasonal and annual variability in flows. Most of the watershed is U.S. Bureau of Land Management or National Park land. The Amargosa River is not designated for the Municipal and Domestic Supply (MUN) beneficial use. The MUN use designation was removed in Basin Plan amendments that took effect in 2002. The rationale for removing the use included naturally high salinity and levels of toxic substances such as arsenic, and fluctuating water quantity that would make the river an unreliable supply if treatment were feasible. The perennial reaches of the Amargosa River and the associated riparian areas support a complex of rare, threatened or endangered fish and wildlife species. To Lahontan Water Board staffs knowledge, there are no salmonids in the river and there is no warm water fishery for human consumption.
QAPP Information: | The data meet the quality assurance requirements of the SWAMP QAPP.
QAPP Information Reference(s):

DECISION ID | 28328 | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)

Pollutant: | Copper
Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)(2010)
Revision Status | Revised
Impairment from Pollutant or Pollution: | Pollutant
Regional Board Staff Conclusion: | The LOE was incorrectly assigned to the waterbody so there is no data available for this waterbody/pollutant combination. The mapped representation of this waterbody was corrected this cycle. This decision is being decommissioned (to be retired next cycle) while a copy of it as a "Do Not List" now lives with the new mapped representation of this waterbody.
Regional Board Staff Decision Recommendation: |

Line of Evidence (LOE) for Decision ID 28328, Copper | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)
LOE ID: | 25073
Pollutant: | Copper
LOE Subgroup: | Pollutant-Water
Matrix: | Water
Fraction: | Dissolved
Beneficial Use: | Inland Saline Water Habitat
Number of Samples: | 2
Number of Exceedances: | 2
Data and Information Type: | Fixed station physical/chemical (conventional plus toxic pollutants)
Data Used to Assess Water Quality: | The U.S. Geological Survey sampled this station on on March 18, 2004 and March 16, 2005 under the Region 6 SWAMP program. Concentrations of dissolved copper in two samples were 3.3 and 3.2 ug/L.
Data Reference: | 2007. SWAMP Data for the Amargosa Hydrologic Unit
SWAMP Data: | SWAMP
Water Quality Objective/Criterion: | The California Toxics Rule's saltwater aquatic life standards for dissolved copper include an acute toxicity limit of 4.8 ug/L and a chronic toxicity limit of 3.1 ug/L.
Objective/Criterion Reference: | Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | One station, Amargosa River below Willow Creek, was sampled.
Temporal Representation: | Two samples were collected on March 18, 2004 and March 16, 2005.
Environmental Conditions: | The Amargosa River flows into California from Nevada and terminates in Death Valley. It is mostly ephemeral but there are perennial reaches. There is great seasonal and annual variability in flows. Most of the watershed is U.S. Bureau of Land Management or National Park land. The Amargosa River is not designated for the Municipal and Domestic Supply (MUN) beneficial use. The MUN use designation was removed in Basin Plan amendments that took effect in 2002. The rationale for removing the use included naturally high salinity and levels of toxic substances such as arsenic, and fluctuating water quantity that would make the river an unreliable supply if treatment were feasible. The perennial reaches of the Amargosa River and the associated riparian areas support a complex of rare, threatened or endangered fish and wildlife species. To Lahontan Water Board staffs knowledge, there are no salmonids in the river and there is no warm water fishery for human consumption.
QAPP Information: | The data meet the quality assurance requirements of the SWAMP QAPP.
QAPP Information Reference(s):
Line of Evidence (LOE) for Decision ID 28328, Copper | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)
LOE ID: | 24933
Pollutant: | Copper
LOE Subgroup: | Pollutant-Sediment
Matrix: | Sediment
Fraction: | None
Beneficial Use: | Inland Saline Water Habitat
Number of Samples: | 1
Number of Exceedances: | 0
Data and Information Type: | Chemical monitoring of sediments
Data Used to Assess Water Quality: | The U.S. Geological Survey sampled sediment at this station on March 16, 2005 under the Region 6 SWAMP program. Results were reported as "bed sediment, smaller than 62.5 um, wet sieved, total digestion." The concentration of copper was 10 ug/g dry weight.
Data Reference: | 2007. SWAMP Data for the Amargosa Hydrologic Unit
SWAMP Data: | SWAMP
Water Quality Objective/Criterion: | There are no state or federal standards or criteria for copper in sediment in inland saline waters. The Effects Range-Median for copper in marine and estuarine sediments is 270 ug/g dry weight; see Long et al. (1995).
Objective/Criterion Reference: | Incidence of adverse biological effects within ranges of chemical concentrations in marine and estuary sediments. Environmental Management. 19, (1): 81-97
| Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | One station, Amargosa River below Willow Creek, was sampled.
Temporal Representation: | One sediment sample was collected on March 16, 2005.
Environmental Conditions: | The Amargosa River flows into California from Nevada and terminates in Death Valley. It is mostly ephemeral but there are perennial reaches. There is great seasonal and annual variability in flows. Most of the watershed is U.S. Bureau of Land Management or National Park land. The Amargosa River is not designated for the Municipal and Domestic Supply (MUN) beneficial use. The MUN use designation was removed in Basin Plan amendments that took effect in 2002. The rationale for removing the use included naturally high salinity and levels of toxic substances such as arsenic, and fluctuating water quantity that would make the river an unreliable supply if treatment were feasible. The perennial reaches of the Amargosa River and the associated riparian areas support a complex of rare, threatened or endangered fish and wildlife species. To Lahontan Water Board staffs knowledge, there are no salmonids in the river and there is no warm water fishery for human consumption.
QAPP Information: | The data meet the quality assurance requirements of the SWAMP QAPP.
QAPP Information Reference(s):
Line of Evidence (LOE) for Decision ID 28328, Copper | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)
LOE ID: | 25065
Pollutant: | Copper
LOE Subgroup: | Pollutant-Water
Matrix: | Water
Fraction: | Total
Beneficial Use: | Inland Saline Water Habitat
Number of Samples: | 2
Number of Exceedances: | 0
Data and Information Type: | Fixed station physical/chemical (conventional plus toxic pollutants)
Data Used to Assess Water Quality: | The U.S. Geological Survey sampled this station on on March 18, 2004 and March 16, 2005 under the Region 6 SWAMP program. Concentrations of total copper in two samples were 6.3 and 14.8 ug/L.
Data Reference: | 2007. SWAMP Data for the Amargosa Hydrologic Unit
SWAMP Data: | SWAMP
Water Quality Objective/Criterion: | There are no applicable state or federal saltwater aquatic life standards or criteria for total copper in inland saline waters.
Objective/Criterion Reference: | Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | One station, Amargosa River below Willow Creek, was sampled.
Temporal Representation: | Two samples were collected on March 18, 2004 and March 16, 2005.
Environmental Conditions: | The Amargosa River flows into California from Nevada and terminates in Death Valley. It is mostly ephemeral but there are perennial reaches. There is great seasonal and annual variability in flows. Most of the watershed is U.S. Bureau of Land Management or National Park land. The Amargosa River is not designated for the Municipal and Domestic Supply (MUN) beneficial use. The MUN use designation was removed in Basin Plan amendments that took effect in 2002. The rationale for removing the use included naturally high salinity and levels of toxic substances such as arsenic, and fluctuating water quantity that would make the river an unreliable supply if treatment were feasible. The perennial reaches of the Amargosa River and the associated riparian areas support a complex of rare, threatened or endangered fish and wildlife species. To Lahontan Water Board staffs knowledge, there are no salmonids in the river and there is no warm water fishery for human consumption.
QAPP Information: | The data meet the quality assurance requirements of the SWAMP QAPP.
QAPP Information Reference(s):

DECISION ID | 28480 | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)

Pollutant: | Deuterium/Protium ratio
Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)(2010)
Revision Status | Revised
Impairment from Pollutant or Pollution: | Pollutant
Regional Board Staff Conclusion: | The LOE was incorrectly assigned to the waterbody so there is no data available for this waterbody/pollutant combination. The mapped representation of this waterbody was corrected this cycle. This decision is being decommissioned (to be retired next cycle) while a copy of it as a "Do Not List" now lives with the new mapped representation of this waterbody.
Regional Board Staff Decision Recommendation: |

Line of Evidence (LOE) for Decision ID 28480, Deuterium/Protium ratio | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)
LOE ID: | 27064
Pollutant: | Deuterium/Protium ratio
LOE Subgroup: | Pollutant-Water
Matrix: | Water
Fraction: | None
Beneficial Use: | Inland Saline Water Habitat
Number of Samples: | 2
Number of Exceedances: | 0
Data and Information Type: | Fixed station physical/chemical (conventional plus toxic pollutants)
Data Used to Assess Water Quality: | The U.S. Geological Survey sampled this station on on March 18, 2004 and March 16, 2005 under the Region 6 SWAMP program. The deuterium/protium ratios in two samples were -90.7 and -90.1 per mL.
Data Reference: | 2007. SWAMP Data for the Amargosa Hydrologic Unit
SWAMP Data: | SWAMP
Water Quality Objective/Criterion: | There are no state or federal saltwater aquatic life standards or criteria for deuterium/protium ratio in inland saline waters.
Objective/Criterion Reference: | Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | One station, Amargosa River below Willow Creek, was sampled.
Temporal Representation: | Two samples were collected on March 18, 2004 and March 16, 2005.
Environmental Conditions: | The Amargosa River flows into California from Nevada and terminates in Death Valley. It is mostly ephemeral but there are perennial reaches. There is great seasonal and annual variability in flows. Most of the watershed is U.S. Bureau of Land Management or National Park land. The Amargosa River is not designated for the Municipal and Domestic Supply (MUN) beneficial use. The MUN use designation was removed in Basin Plan amendments that took effect in 2002. The rationale for removing the use included naturally high salinity and levels of toxic substances such as arsenic, and fluctuating water quantity that would make the river an unreliable supply if treatment were feasible. The perennial reaches of the Amargosa River and the associated riparian areas support a complex of rare, threatened or endangered fish and wildlife species. To Lahontan Water Board staffs knowledge, there are no salmonids in the river and there is no warm water fishery for human consumption.
QAPP Information: | The data meet the quality assurance requirements of the SWAMP QAPP.
QAPP Information Reference(s):

DECISION ID | 24358 | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)

Pollutant: | Dissolved oxygen saturation
Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)(2010)
Revision Status | Revised
Impairment from Pollutant or Pollution: | Pollutant
Regional Board Staff Conclusion: | The LOE was incorrectly assigned to the waterbody so there is no data available for this waterbody/pollutant combination. The mapped representation of this waterbody was corrected this cycle. This decision is being decommissioned (to be retired next cycle) while a copy of it as a "Do Not List" now lives with the new mapped representation of this waterbody.
Regional Board Staff Decision Recommendation: |

Line of Evidence (LOE) for Decision ID 24358, Dissolved oxygen saturation | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)
LOE ID: | 25193
Pollutant: | Dissolved oxygen saturation
LOE Subgroup: | Pollutant-Water
Matrix: | Water
Fraction: | Dissolved
Beneficial Use: | Warm Freshwater Habitat
Number of Samples: | 2
Number of Exceedances: | 1
Data and Information Type: | Fixed station physical/chemical (conventional plus toxic pollutants)
Data Used to Assess Water Quality: | The U.S. Geological Survey sampled this station on on March 18, 2004 and March 16, 2005 under the Region 6 SWAMP program. Two sample had dissolved oxygen saturation values of 106 and 75 percent.
Data Reference: | 2007. SWAMP Data for the Amargosa Hydrologic Unit
SWAMP Data: | SWAMP
Water Quality Objective/Criterion: | .The Lahontan Basin Plan's water quality objective states that percent saturation shall not be depressed by more than 10 percent and minimum dissolved oxygen concentration shall not be less than 80 percent saturation.
Objective/Criterion Reference: | Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | One station, Amargosa River below Willow Creek, was sampled.
Temporal Representation: | Two samples were collected on March 18, 2004 and March 16, 2005.
Environmental Conditions: | The Amargosa River flows into California from Nevada and terminates in Death Valley. It is mostly ephemeral but there are perennial reaches. There is great seasonal and annual variability in flows. Most of the watershed is U.S. Bureau of Land Management or National Park land. The Amargosa River is not designated for the Municipal and Domestic Supply (MUN) beneficial use. The MUN use designation was removed in Basin Plan amendments that took effect in 2002. The rationale for removing the use included naturally high salinity and levels of toxic substances such as arsenic, and fluctuating water quantity that would make the river an unreliable supply if treatment were feasible. The perennial reaches of the Amargosa River and the associated riparian areas support a complex of rare, threatened or endangered fish and wildlife species. To Lahontan Water Board staffs knowledge, there are no salmonids in the river and there is no warm water fishery for human consumption.
QAPP Information: | The data meet the quality assurance requirements of the SWAMP QAPP.
QAPP Information Reference(s):

DECISION ID | 25044 | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)

Pollutant: | Europium
Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)(2010)
Revision Status | Revised
Impairment from Pollutant or Pollution: | Pollutant
Regional Board Staff Conclusion: | The LOE was incorrectly assigned to the waterbody so there is no data available for this waterbody/pollutant combination. The mapped representation of this waterbody was corrected this cycle. This decision is being decommissioned (to be retired next cycle) while a copy of it as a "Do Not List" now lives with the new mapped representation of this waterbody.
Regional Board Staff Decision Recommendation: |

Line of Evidence (LOE) for Decision ID 25044, Europium | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)
LOE ID: | 24901
Pollutant: | Europium
LOE Subgroup: | Pollutant-Sediment
Matrix: | Sediment
Fraction: | None
Beneficial Use: | Inland Saline Water Habitat
Number of Samples: | 1
Number of Exceedances: | 0
Data and Information Type: | Chemical monitoring of sediments
Data Used to Assess Water Quality: | The U.S. Geological Survey sampled sediment at this station on March 16, 2005 under the Region 6 SWAMP program. Results were reported as "bed sediment, smaller than 62.5 um, wet sieved, total digestion." The concentration of europium was 1 ug/g dry weight.
Data Reference: | 2007. SWAMP Data for the Amargosa Hydrologic Unit
SWAMP Data: | SWAMP
Water Quality Objective/Criterion: | There are no state or federal standards or criteria for europium in sediment in inland saline waters.
Objective/Criterion Reference: | Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | One station, Amargosa River below Willow Creek, was sampled.
Temporal Representation: | One sediment sample was collected on March 16, 2005.
Environmental Conditions: | The Amargosa River flows into California from Nevada and terminates in Death Valley. It is mostly ephemeral but there are perennial reaches. There is great seasonal and annual variability in flows. Most of the watershed is U.S. Bureau of Land Management or National Park land. The Amargosa River is not designated for the Municipal and Domestic Supply (MUN) beneficial use. The MUN use designation was removed in Basin Plan amendments that took effect in 2002. The rationale for removing the use included naturally high salinity and levels of toxic substances such as arsenic, and fluctuating water quantity that would make the river an unreliable supply if treatment were feasible. The perennial reaches of the Amargosa River and the associated riparian areas support a complex of rare, threatened or endangered fish and wildlife species. To Lahontan Water Board staffs knowledge, there are no salmonids in the river and there is no warm water fishery for human consumption.
QAPP Information: | The data meet the quality assurance requirements of the SWAMP QAPP.
QAPP Information Reference(s):

DECISION ID | 28424 | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)

Pollutant: | Fecal Coliform
Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)(2010)
Revision Status | Revised
Impairment from Pollutant or Pollution: | Pollutant
Regional Board Staff Conclusion: | The LOE was incorrectly assigned to the waterbody so there is no data available for this waterbody/pollutant combination. The mapped representation of this waterbody was corrected this cycle. This decision is being decommissioned (to be retired next cycle) while a copy of it as a "Do Not List" now lives with the new mapped representation of this waterbody.
Regional Board Staff Decision Recommendation: | The mapped representation of this waterbody was corrected this cycle. This decision is being decommissioned (to be retired next cycle) while a copy of it as a "Do Not List" now lives with the new mapped representation of this waterbody which is Amargosa River (Willow Creek Confluence to Badwater).

Line of Evidence (LOE) for Decision ID 28424, Fecal Coliform | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)
LOE ID: | 25219
Pollutant: | Fecal Coliform
LOE Subgroup: | Pollutant-Water
Matrix: | Water
Fraction: | None
Beneficial Use: | Water Contact Recreation
Number of Samples: | 1
Number of Exceedances: | 0
Data and Information Type: | Water column surveys (e.g. fecal coliform)
Data Used to Assess Water Quality: | The U.S. Geological Survey sampled sediment at this station on March 18 2004 under the Region 6 SWAMP program. The fecal coliform count in one sample was an estimated value.
Data Reference: | 2007. SWAMP Data for the Amargosa Hydrologic Unit
SWAMP Data: | SWAMP
Water Quality Objective/Criterion: | The Lahontan Basin Plan's objective for coliform bacteria states: "Waters shall not contain concentrations of coliform organisms attributable to anthropogenic sources, including human and livestock wastes. The fecal coliform concentration during any 30-day period shall not exceed a log mean of 20/100 ml, nor shall more than 10 percent of all samples collected during any 30-day period exceed 40/100 ml. The log mean shall ideally be based on a minimum of not less than five samples collected as evenly spaced as practicable during any 30-day period. However, a log mean concentration exceeding 20/100 ml for any 30-day period shall indicate violation of this objective even if fewer than five samples were collected."
Objective/Criterion Reference: | Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | One station, Amargosa River below Willow Creek, was sampled.
Temporal Representation: | One sample was collected on March 18, 2004.
Environmental Conditions: | The Amargosa River flows into California from Nevada and terminates in Death Valley. It is mostly ephemeral but there are perennial reaches. There is great seasonal and annual variability in flows. Most of the watershed is U.S. Bureau of Land Management or National Park land. The Amargosa River is not designated for the Municipal and Domestic Supply (MUN) beneficial use. The MUN use designation was removed in Basin Plan amendments that took effect in 2002. The rationale for removing the use included naturally high salinity and levels of toxic substances such as arsenic, and fluctuating water quantity that would make the river an unreliable supply if treatment were feasible. The perennial reaches of the Amargosa River and the associated riparian areas support a complex of rare, threatened or endangered fish and wildlife species. To Lahontan Water Board staffs knowledge, there are no salmonids in the river and there is no warm water fishery for human consumption.
QAPP Information: | The data meet the quality assurance requirements of the SWAMP QAPP.
QAPP Information Reference(s):

DECISION ID | 25750 | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)

Pollutant: | Fluoride
Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)(2010)
Revision Status | Revised
Impairment from Pollutant or Pollution: | Pollutant
Regional Board Staff Conclusion: | The LOE was incorrectly assigned to the waterbody so there is no data available for this waterbody/pollutant combination. The mapped representation of this waterbody was corrected this cycle. This decision is being decommissioned (to be retired next cycle) while a copy of it as a "Do Not List" now lives with the new mapped representation of this waterbody.
Regional Board Staff Decision Recommendation: |

Line of Evidence (LOE) for Decision ID 25750, Fluoride | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)
LOE ID: | 25208
Pollutant: | Fluoride
LOE Subgroup: | Pollutant-Water
Matrix: | Water
Fraction: | Dissolved
Beneficial Use: | Inland Saline Water Habitat
Number of Samples: | 2
Number of Exceedances: | 0
Data and Information Type: | Fixed station physical/chemical (conventional plus toxic pollutants)
Data Used to Assess Water Quality: | The U.S. Geological Survey sampled this station on on March 18, 2004 and March 16, 2005 under the Region 6 SWAMP program. Two samples had dissolved fluoride concentrations of 4.5 and 4.0 mg/L.
Data Reference: | 2007. SWAMP Data for the Amargosa Hydrologic Unit
SWAMP Data: | SWAMP
Water Quality Objective/Criterion: | There are no applicable state or federal saltwater aquatic life standards or criteria for fluoride in inland saline waters.
Objective/Criterion Reference: | Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | One station, Amargosa River below Willow Creek, was sampled.
Temporal Representation: | Two samples were collected on March 18, 2004 and March 16, 2005.
Environmental Conditions: | The Amargosa River flows into California from Nevada and terminates in Death Valley. It is mostly ephemeral but there are perennial reaches. There is great seasonal and annual variability in flows. Most of the watershed is U.S. Bureau of Land Management or National Park land. The Amargosa River is not designated for the Municipal and Domestic Supply (MUN) beneficial use. The MUN use designation was removed in Basin Plan amendments that took effect in 2002. The rationale for removing the use included naturally high salinity and levels of toxic substances such as arsenic, and fluctuating water quantity that would make the river an unreliable supply if treatment were feasible. The perennial reaches of the Amargosa River and the associated riparian areas support a complex of rare, threatened or endangered fish and wildlife species. To Lahontan Water Board staffs knowledge, there are no salmonids in the river and there is no warm water fishery for human consumption.
QAPP Information: | The data meet the quality assurance requirements of the SWAMP QAPP.
QAPP Information Reference(s):

DECISION ID | 23948 | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)

Pollutant: | Gold
Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)(2010)
Revision Status | Revised
Impairment from Pollutant or Pollution: | Pollutant
Regional Board Staff Conclusion: | The LOE was incorrectly assigned to the waterbody so there is no data available for this waterbody/pollutant combination. The mapped representation of this waterbody was corrected this cycle. This decision is being decommissioned (to be retired next cycle) while a copy of it as a "Do Not List" now lives with the new mapped representation of this waterbody.
Regional Board Staff Decision Recommendation: |

Line of Evidence (LOE) for Decision ID 23948, Gold | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)
LOE ID: | 24903
Pollutant: | Gold
LOE Subgroup: | Pollutant-Sediment
Matrix: | Sediment
Fraction: | None
Beneficial Use: | Inland Saline Water Habitat
Number of Samples: | 1
Number of Exceedances: | 0
Data and Information Type: | Chemical monitoring of sediments
Data Used to Assess Water Quality: | The U.S. Geological Survey sampled sediment at this station on March 16, 2005 under the Region 6 SWAMP program. Results were reported as "bed sediment, smaller than 62.5 um, wet sieved, total digestion." The concentration of gold was below the detection level.
Data Reference: | 2007. SWAMP Data for the Amargosa Hydrologic Unit
SWAMP Data: | SWAMP
Water Quality Objective/Criterion: | There are no state or federal standards or criteria for gold in sediment in inland saline waters.
Objective/Criterion Reference: | Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | One station, Amargosa River below Willow Creek, was sampled.
Temporal Representation: | One sediment sample was collected on March 16, 2005.
Environmental Conditions: | The Amargosa River flows into California from Nevada and terminates in Death Valley. It is mostly ephemeral but there are perennial reaches. There is great seasonal and annual variability in flows. Most of the watershed is U.S. Bureau of Land Management or National Park land. The Amargosa River is not designated for the Municipal and Domestic Supply (MUN) beneficial use. The MUN use designation was removed in Basin Plan amendments that took effect in 2002. The rationale for removing the use included naturally high salinity and levels of toxic substances such as arsenic, and fluctuating water quantity that would make the river an unreliable supply if treatment were feasible. The perennial reaches of the Amargosa River and the associated riparian areas support a complex of rare, threatened or endangered fish and wildlife species. To Lahontan Water Board staffs knowledge, there are no salmonids in the river and there is no warm water fishery for human consumption.
QAPP Information: | The data meet the quality assurance requirements of the SWAMP QAPP.
QAPP Information Reference(s):

DECISION ID | 28502 | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)

Pollutant: | Gross Alpha Radioactivity
Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)(2010)
Revision Status | Revised
Impairment from Pollutant or Pollution: | Pollutant
Regional Board Staff Conclusion: | The LOE was incorrectly assigned to the waterbody so there is no data available for this waterbody/pollutant combination. The mapped representation of this waterbody was corrected this cycle. This decision is being decommissioned (to be retired next cycle) while a copy of it as a "Do Not List" now lives with the new mapped representation of this waterbody.
Regional Board Staff Decision Recommendation: |

Line of Evidence (LOE) for Decision ID 28502, Gross Alpha Radioactivity | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)
LOE ID: | 27065
Pollutant: | Gross Alpha Radioactivity
LOE Subgroup: | Pollutant-Water
Matrix: | Water
Fraction: | None
Beneficial Use: | Inland Saline Water Habitat
Number of Samples: | 2
Number of Exceedances: | 0
Data and Information Type: | Fixed station physical/chemical (conventional plus toxic pollutants)
Data Used to Assess Water Quality: | The U.S. Geological Survey sampled this station on on March 18, 2004 and March 16, 2005 under the Region 6 SWAMP program. Two samples had gross alpha radioactivity levels of 13 and 30 pCi/L..
Data Reference: | 2007. SWAMP Data for the Amargosa Hydrologic Unit
SWAMP Data: | SWAMP
Water Quality Objective/Criterion: | There are no state or federal saltwater aquatic life standards or criteria specifically for gross alpha radioactivity in inland saline waters. The Lahontan Basin Plan's narrative objective for radioactivity provdes that: "Radionuclides shall not be present in concentrations which are deleterious to human, plant, animal, or aquatic life nor which result in the accumulation of radionuclides in the food web to an estent which presents a hazard to human, plant, animal or aquatic life." The objective also incorporates California Maximum Contaminant Levels for waters designated for the MUN use. MCLs do not apply to the Amargosa River.
Objective/Criterion Reference: | Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | One station, Amargosa River below Willow Creek, was sampled.
Temporal Representation: | Two samples were collected on March 18, 2004 and March 16, 2005.
Environmental Conditions: | The Amargosa River flows into California from Nevada and terminates in Death Valley. It is mostly ephemeral but there are perennial reaches. There is great seasonal and annual variability in flows. Most of the watershed is U.S. Bureau of Land Management or National Park land. The Amargosa River is not designated for the Municipal and Domestic Supply (MUN) beneficial use. The MUN use designation was removed in Basin Plan amendments that took effect in 2002. The rationale for removing the use included naturally high salinity and levels of toxic substances such as arsenic, and fluctuating water quantity that would make the river an unreliable supply if treatment were feasible. The perennial reaches of the Amargosa River and the associated riparian areas support a complex of rare, threatened or endangered fish and wildlife species. To Lahontan Water Board staffs knowledge, there are no salmonids in the river and there is no warm water fishery for human consumption.
QAPP Information: | The data meet the quality assurance requirements of the SWAMP QAPP.
QAPP Information Reference(s):

DECISION ID | 28331 | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)

Pollutant: | Gross Beta Radioactivity
Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)(2010)
Revision Status | Revised
Impairment from Pollutant or Pollution: | Pollutant
Regional Board Staff Conclusion: | The LOE was incorrectly assigned to the waterbody so there is no data available for this waterbody/pollutant combination. The mapped representation of this waterbody was corrected this cycle. This decision is being decommissioned (to be retired next cycle) while a copy of it as a "Do Not List" now lives with the new mapped representation of this waterbody.
Regional Board Staff Decision Recommendation: |

Line of Evidence (LOE) for Decision ID 28331, Gross Beta Radioactivity | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)
LOE ID: | 27135
Pollutant: | Gross Beta Radioactivity
LOE Subgroup: | Pollutant-Water
Matrix: | Water
Fraction: | None
Beneficial Use: | Inland Saline Water Habitat
Number of Samples: | 2
Number of Exceedances: | 0
Data and Information Type: | Fixed station physical/chemical (conventional plus toxic pollutants)
Data Used to Assess Water Quality: | The U.S. Geological Survey sampled this station on on March 18, 2004 and March 16, 2005 under the Region 6 SWAMP program. Two samples had gross beta radioactivity levels of 45 and 64 pCi/L..
Data Reference: | 2007. SWAMP Data for the Amargosa Hydrologic Unit
SWAMP Data: | SWAMP
Water Quality Objective/Criterion: | There are no state or federal saltwater aquatic life standards or criteria specifically for gross beta radioactivity in inland saline waters. The Lahontan Basin Plan's narrative objective for radioactivity provdes that: "Radionuclides shall not be present in concentrations which are deleterious to human, plant, animal, or aquatic life nor which result in the accumulation of radionuclides in the food web to an estent which presents a hazard to human, plant, animal or aquatic life." The objective also incorporates California Maximum Contaminant Levels for waters designated for the MUN use. MCLs do not apply to the Amargosa River.
Objective/Criterion Reference: | Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | One station, Amargosa River below Willow Creek, was sampled.
Temporal Representation: | Two samples were collected on March 18, 2004 and March 16, 2005.
Environmental Conditions: | The Amargosa River flows into California from Nevada and terminates in Death Valley. It is mostly ephemeral but there are perennial reaches. There is great seasonal and annual variability in flows. Most of the watershed is U.S. Bureau of Land Management or National Park land. The Amargosa River is not designated for the Municipal and Domestic Supply (MUN) beneficial use. The MUN use designation was removed in Basin Plan amendments that took effect in 2002. The rationale for removing the use included naturally high salinity and levels of toxic substances such as arsenic, and fluctuating water quantity that would make the river an unreliable supply if treatment were feasible. The perennial reaches of the Amargosa River and the associated riparian areas support a complex of rare, threatened or endangered fish and wildlife species. To Lahontan Water Board staffs knowledge, there are no salmonids in the river and there is no warm water fishery for human consumption.
QAPP Information: | The data meet the quality assurance requirements of the SWAMP QAPP.
QAPP Information Reference(s):

DECISION ID | 28369 | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)

Pollutant: | Hardness
Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)(2010)
Revision Status | Revised
Impairment from Pollutant or Pollution: | Pollutant
Regional Board Staff Conclusion: | The LOE was incorrectly assigned to the waterbody so there is no data available for this waterbody/pollutant combination. The mapped representation of this waterbody was corrected this cycle. This decision is being decommissioned (to be retired next cycle) while a copy of it as a "Do Not List" now lives with the new mapped representation of this waterbody.
Regional Board Staff Decision Recommendation: | The mapped representation of this waterbody was corrected this cycle. This decision is being decommissioned (to be retired next cycle) while a copy of it as a "Do Not List" now lives with the new mapped representation of this waterbody which is Amargosa River (Willow Creek Confluence to Badwater).

Line of Evidence (LOE) for Decision ID 28369, Hardness | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)
LOE ID: | 25197
Pollutant: | Hardness
LOE Subgroup: | Pollutant-Water
Matrix: | Water
Fraction: | None
Beneficial Use: | Inland Saline Water Habitat
Number of Samples: | 2
Number of Exceedances: | 0
Data and Information Type: | Fixed station physical/chemical (conventional plus toxic pollutants)
Data Used to Assess Water Quality: | The U.S. Geological Survey sampled this station on on March 18, 2004 and March 16, 2005 under the Region 6 SWAMP program. Two samples had hardness values of 240 and 380 mg/L CaCO3.
Data Reference: | 2007. SWAMP Data for the Amargosa Hydrologic Unit
SWAMP Data: | SWAMP
Water Quality Objective/Criterion: | There are no state or federal saltwater aquatic life standards or criteria for hardness in inland saline waters. Hardness is monitored for purposes such as determination of the applicable criteria and standards for metals whose toxicity is hardness-dependent. The U.S. Environmental Protection Agency's 1986 "Gold Book" includes generally accepted categories of hardness. Calcium and magnesium are the major ions contributing to hardness, and hardness is generally expressed as calcium carbonate. Water with a hardness equivalent to 0-75 mg equivalent CaCO3/L is considered "soft."
Objective/Criterion Reference: | Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | One station, Amargosa River below Willow Creek, was sampled.
Temporal Representation: | Two samples were collected on March 18, 2004 and March 16, 2005.
Environmental Conditions: | The Amargosa River flows into California from Nevada and terminates in Death Valley. It is mostly ephemeral but there are perennial reaches. There is great seasonal and annual variability in flows. Most of the watershed is U.S. Bureau of Land Management or National Park land. The Amargosa River is not designated for the Municipal and Domestic Supply (MUN) beneficial use. The MUN use designation was removed in Basin Plan amendments that took effect in 2002. The rationale for removing the use included naturally high salinity and levels of toxic substances such as arsenic, and fluctuating water quantity that would make the river an unreliable supply if treatment were feasible. The perennial reaches of the Amargosa River and the associated riparian areas support a complex of rare, threatened or endangered fish and wildlife species. To Lahontan Water Board staffs knowledge, there are no salmonids in the river and there is no warm water fishery for human consumption.
QAPP Information: | The data meet the quality assurance requirements of the SWAMP QAPP.
QAPP Information Reference(s):

DECISION ID | 23960 | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)

Pollutant: | Holmium
Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)(2010)
Revision Status | Revised
Impairment from Pollutant or Pollution: | Pollutant
Regional Board Staff Conclusion: | The LOE was incorrectly assigned to the waterbody so there is no data available for this waterbody/pollutant combination. The mapped representation of this waterbody was corrected this cycle. This decision is being decommissioned (to be retired next cycle) while a copy of it as a "Do Not List" now lives with the new mapped representation of this waterbody.
Regional Board Staff Decision Recommendation: |

Line of Evidence (LOE) for Decision ID 23960, Holmium | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)
LOE ID: | 24904
Pollutant: | Holmium
LOE Subgroup: | Pollutant-Sediment
Matrix: | Sediment
Fraction: | None
Beneficial Use: | Inland Saline Water Habitat
Number of Samples: | 1
Number of Exceedances: | 0
Data and Information Type: | Chemical monitoring of sediments
Data Used to Assess Water Quality: | The U.S. Geological Survey sampled sediment at this station on March 16, 2005 under the Region 6 SWAMP program. Results were reported as "bed sediment, smaller than 62.5 um, wet sieved, total digestion." The concentration of holmium was below the detection level.
Data Reference: | 2007. SWAMP Data for the Amargosa Hydrologic Unit
SWAMP Data: | SWAMP
Water Quality Objective/Criterion: | There are no state or federal standards or criteria for holmium in sediment in inland saline waters.
Objective/Criterion Reference: | Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | One station, Amargosa River below Willow Creek, was sampled.
Temporal Representation: | One sediment sample was collected on March 16, 2005.
Environmental Conditions: | The Amargosa River flows into California from Nevada and terminates in Death Valley. It is mostly ephemeral but there are perennial reaches. There is great seasonal and annual variability in flows. Most of the watershed is U.S. Bureau of Land Management or National Park land. The Amargosa River is not designated for the Municipal and Domestic Supply (MUN) beneficial use. The MUN use designation was removed in Basin Plan amendments that took effect in 2002. The rationale for removing the use included naturally high salinity and levels of toxic substances such as arsenic, and fluctuating water quantity that would make the river an unreliable supply if treatment were feasible. The perennial reaches of the Amargosa River and the associated riparian areas support a complex of rare, threatened or endangered fish and wildlife species. To Lahontan Water Board staffs knowledge, there are no salmonids in the river and there is no warm water fishery for human consumption.
QAPP Information: | The data meet the quality assurance requirements of the SWAMP QAPP.
QAPP Information Reference(s):

DECISION ID | 24400 | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)

Pollutant: | Iron
Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)(2010)
Revision Status | Revised
Impairment from Pollutant or Pollution: | Pollutant
Regional Board Staff Conclusion: | The LOE was incorrectly assigned to the waterbody so there is no data available for this waterbody/pollutant combination. The mapped representation of this waterbody was corrected this cycle. This decision is being decommissioned (to be retired next cycle) while a copy of it as a "Do Not List" now lives with the new mapped representation of this waterbody.
Regional Board Staff Decision Recommendation: |

Line of Evidence (LOE) for Decision ID 24400, Iron | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)
LOE ID: | 24905
Pollutant: | Iron
LOE Subgroup: | Pollutant-Sediment
Matrix: | Sediment
Fraction: | None
Beneficial Use: | Inland Saline Water Habitat
Number of Samples: | 1
Number of Exceedances: | 0
Data and Information Type: | Chemical monitoring of sediments
Data Used to Assess Water Quality: | The U.S. Geological Survey sampled sediment at this station on March 16, 2005 under the Region 6 SWAMP program. Results were reported as "bed sediment, smaller than 62.5 um, wet sieved, total digestion." The concentration of iron was 1.7 percent dry weight.
Data Reference: | 2007. SWAMP Data for the Amargosa Hydrologic Unit
SWAMP Data: | SWAMP
Water Quality Objective/Criterion: | There are no state or federal standards or criteria for iron in sediment in inland saline waters.
Objective/Criterion Reference: | Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | One station, Amargosa River below Willow Creek, was sampled.
Temporal Representation: | One sediment sample was collected on March 16, 2004.
Environmental Conditions: | The Amargosa River flows into California from Nevada and terminates in Death Valley. It is mostly ephemeral but there are perennial reaches. There is great seasonal and annual variability in flows. Most of the watershed is U.S. Bureau of Land Management or National Park land. The Amargosa River is not designated for the Municipal and Domestic Supply (MUN) beneficial use. The MUN use designation was removed in Basin Plan amendments that took effect in 2002. The rationale for removing the use included naturally high salinity and levels of toxic substances such as arsenic, and fluctuating water quantity that would make the river an unreliable supply if treatment were feasible. The perennial reaches of the Amargosa River and the associated riparian areas support a complex of rare, threatened or endangered fish and wildlife species. To Lahontan Water Board staffs knowledge, there are no salmonids in the river and there is no warm water fishery for human consumption.
QAPP Information: | The data meet the quality assurance requirements of the SWAMP QAPP.
QAPP Information Reference(s):
Line of Evidence (LOE) for Decision ID 24400, Iron | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)
LOE ID: | 25070
Pollutant: | Iron
LOE Subgroup: | Pollutant-Water
Matrix: | Water
Fraction: | Total
Beneficial Use: | Inland Saline Water Habitat
Number of Samples: | 2
Number of Exceedances: | 0
Data and Information Type: | Fixed station physical/chemical (conventional plus toxic pollutants)
Data Used to Assess Water Quality: | The U.S. Geological Survey sampled this station on on March 18, 2004 and March 16, 2005 under the Region 6 SWAMP program. One of two samples for total iron was an estimated value and the other had a concentration of 30 ug/L.
Data Reference: | 2007. SWAMP Data for the Amargosa Hydrologic Unit
SWAMP Data: | SWAMP
Water Quality Objective/Criterion: | There are no applicable state or federal saltwater aquatic life standards or criteria for total iron in inland saline waters.
Objective/Criterion Reference: | Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | One station, Amargosa River below Willow Creek, was sampled.
Temporal Representation: | Two samples were collected on March 18, 2004 and March 16, 2005.
Environmental Conditions: | The Amargosa River flows into California from Nevada and terminates in Death Valley. It is mostly ephemeral but there are perennial reaches. There is great seasonal and annual variability in flows. Most of the watershed is U.S. Bureau of Land Management or National Park land. The Amargosa River is not designated for the Municipal and Domestic Supply (MUN) beneficial use. The MUN use designation was removed in Basin Plan amendments that took effect in 2002. The rationale for removing the use included naturally high salinity and levels of toxic substances such as arsenic, and fluctuating water quantity that would make the river an unreliable supply if treatment were feasible. The perennial reaches of the Amargosa River and the associated riparian areas support a complex of rare, threatened or endangered fish and wildlife species. To Lahontan Water Board staffs knowledge, there are no salmonids in the river and there is no warm water fishery for human consumption.
QAPP Information: | The data meet the quality assurance requirements of the SWAMP QAPP.
QAPP Information Reference(s):
Line of Evidence (LOE) for Decision ID 24400, Iron | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)
LOE ID: | 25068
Pollutant: | Iron
LOE Subgroup: | Pollutant-Water
Matrix: | Water
Fraction: | Dissolved
Beneficial Use: | Inland Saline Water Habitat
Number of Samples: | 2
Number of Exceedances: | 0
Data and Information Type: | Fixed station physical/chemical (conventional plus toxic pollutants)
Data Used to Assess Water Quality: | The U.S. Geological Survey sampled this station on on March 18, 2004 and March 16, 2005 under the Region 6 SWAMP program. One of two samples for dissolved iron was an estimated value and the other had a concentration of 30 ug/L.
Data Reference: | 2007. SWAMP Data for the Amargosa Hydrologic Unit
SWAMP Data: | SWAMP
Water Quality Objective/Criterion: | There are no applicable state or federal saltwater aquatic life standards or criteria for dissolved iron in inland saline waters.
Objective/Criterion Reference: | Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | One station, Amargosa River below Willow Creek, was sampled.
Temporal Representation: | Two samples were collected on March 18, 2004 and March 16, 2005.
Environmental Conditions: | The Amargosa River flows into California from Nevada and terminates in Death Valley. It is mostly ephemeral but there are perennial reaches. There is great seasonal and annual variability in flows. Most of the watershed is U.S. Bureau of Land Management or National Park land. The Amargosa River is not designated for the Municipal and Domestic Supply (MUN) beneficial use. The MUN use designation was removed in Basin Plan amendments that took effect in 2002. The rationale for removing the use included naturally high salinity and levels of toxic substances such as arsenic, and fluctuating water quantity that would make the river an unreliable supply if treatment were feasible. The perennial reaches of the Amargosa River and the associated riparian areas support a complex of rare, threatened or endangered fish and wildlife species. To Lahontan Water Board staffs knowledge, there are no salmonids in the river and there is no warm water fishery for human consumption.
QAPP Information: | The data meet the quality assurance requirements of the SWAMP QAPP.
QAPP Information Reference(s):

DECISION ID | 25045 | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)

Pollutant: | Lanthanum
Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)(2010)
Revision Status | Revised
Impairment from Pollutant or Pollution: | Pollutant
Regional Board Staff Conclusion: | The LOE was incorrectly assigned to the waterbody so there is no data available for this waterbody/pollutant combination. The mapped representation of this waterbody was corrected this cycle. This decision is being decommissioned (to be retired next cycle) while a copy of it as a "Do Not List" now lives with the new mapped representation of this waterbody.
Regional Board Staff Decision Recommendation: |

Line of Evidence (LOE) for Decision ID 25045, Lanthanum | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)
LOE ID: | 24906
Pollutant: | Lanthanum
LOE Subgroup: | Pollutant-Sediment
Matrix: | Sediment
Fraction: | None
Beneficial Use: | Inland Saline Water Habitat
Number of Samples: | 1
Number of Exceedances: | 0
Data and Information Type: | Chemical monitoring of sediments
Data Used to Assess Water Quality: | The U.S. Geological Survey sampled sediment at this station on March 16, 2005 under the Region 6 SWAMP program. Results were reported as "bed sediment, smaller than 62.5 um, wet sieved, total digestion." The concentration of lanthanum was 40 ug/g dry weight.
Data Reference: | 2007. SWAMP Data for the Amargosa Hydrologic Unit
SWAMP Data: | SWAMP
Water Quality Objective/Criterion: | There are no state or federal standards or criteria for lanthanum in sediment in inland saline waters.
Objective/Criterion Reference: | Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | One station, Amargosa River below Willow Creek, was sampled.
Temporal Representation: | One sediment sample was collected on March 16, 2005.
Environmental Conditions: | The Amargosa River flows into California from Nevada and terminates in Death Valley. It is mostly ephemeral but there are perennial reaches. There is great seasonal and annual variability in flows. Most of the watershed is U.S. Bureau of Land Management or National Park land. The Amargosa River is not designated for the Municipal and Domestic Supply (MUN) beneficial use. The MUN use designation was removed in Basin Plan amendments that took effect in 2002. The rationale for removing the use included naturally high salinity and levels of toxic substances such as arsenic, and fluctuating water quantity that would make the river an unreliable supply if treatment were feasible. The perennial reaches of the Amargosa River and the associated riparian areas support a complex of rare, threatened or endangered fish and wildlife species. To Lahontan Water Board staffs knowledge, there are no salmonids in the river and there is no warm water fishery for human consumption.
QAPP Information: | The data meet the quality assurance requirements of the SWAMP QAPP.
QAPP Information Reference(s):

DECISION ID | 24544 | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)

Pollutant: | Lead
Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)(2010)
Revision Status | Revised
Impairment from Pollutant or Pollution: | Pollutant
Regional Board Staff Conclusion: | The LOE was incorrectly assigned to the waterbody so there is no data available for this waterbody/pollutant combination. The mapped representation of this waterbody was corrected this cycle. This decision is being decommissioned (to be retired next cycle) while a copy of it as a "Do Not List" now lives with the new mapped representation of this waterbody.
Regional Board Staff Decision Recommendation: |

Line of Evidence (LOE) for Decision ID 24544, Lead | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)
LOE ID: | 25067
Pollutant: | Lead
LOE Subgroup: | Pollutant-Water
Matrix: | Water
Fraction: | Dissolved
Beneficial Use: | Inland Saline Water Habitat
Number of Samples: | 2
Number of Exceedances: | 0
Data and Information Type: | Fixed station physical/chemical (conventional plus toxic pollutants)
Data Used to Assess Water Quality: | The U.S. Geological Survey sampled this station on on March 18, 2004 and March 16, 2005 under the Region 6 SWAMP program. Concentrations of dissolved lead in two samples were 0.21 and 0.22 ug/L.
Data Reference: | 2007. SWAMP Data for the Amargosa Hydrologic Unit
SWAMP Data: | SWAMP
Water Quality Objective/Criterion: | The California Toxics Rule's saltwater aquatic life standards for dissolved lead include an acute toxicity limit of 210 ug/L and a chronic toxicity limit of 8.1 ug/L.
Objective/Criterion Reference: | Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | One station, Amargosa River below Willow Creek, was sampled.
Temporal Representation: | Two samples were collected on March 18, 2004 and March 16, 2005.
Environmental Conditions: | The Amargosa River flows into California from Nevada and terminates in Death Valley. It is mostly ephemeral but there are perennial reaches. There is great seasonal and annual variability in flows. Most of the watershed is U.S. Bureau of Land Management or National Park land. The Amargosa River is not designated for the Municipal and Domestic Supply (MUN) beneficial use. The MUN use designation was removed in Basin Plan amendments that took effect in 2002. The rationale for removing the use included naturally high salinity and levels of toxic substances such as arsenic, and fluctuating water quantity that would make the river an unreliable supply if treatment were feasible. The perennial reaches of the Amargosa River and the associated riparian areas support a complex of rare, threatened or endangered fish and wildlife species. To Lahontan Water Board staffs knowledge, there are no salmonids in the river and there is no warm water fishery for human consumption.
QAPP Information: | The data meet the quality assurance requirements of the SWAMP QAPP.
QAPP Information Reference(s):
Line of Evidence (LOE) for Decision ID 24544, Lead | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)
LOE ID: | 25076
Pollutant: | Lead
LOE Subgroup: | Pollutant-Water
Matrix: | Water
Fraction: | Total
Beneficial Use: | Inland Saline Water Habitat
Number of Samples: | 2
Number of Exceedances: | 0
Data and Information Type: | Fixed station physical/chemical (conventional plus toxic pollutants)
Data Used to Assess Water Quality: | The U.S. Geological Survey sampled this station on on March 18, 2004 and March 16, 2005 under the Region 6 SWAMP program. Concentrations of total lead in two samples were 0.61 and 0.6 ug/L.
Data Reference: | 2007. SWAMP Data for the Amargosa Hydrologic Unit
SWAMP Data: | SWAMP
Water Quality Objective/Criterion: | There are no applicable state or federal saltwater aquatic life standards or criteria for total lead in inland saline waters.
Objective/Criterion Reference: | Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | One station, Amargosa River below Willow Creek, was sampled.
Temporal Representation: | Two samples were collected on March 18, 2004 and March 16, 2005.
Environmental Conditions: | The Amargosa River flows into California from Nevada and terminates in Death Valley. It is mostly ephemeral but there are perennial reaches. There is great seasonal and annual variability in flows. Most of the watershed is U.S. Bureau of Land Management or National Park land. The Amargosa River is not designated for the Municipal and Domestic Supply (MUN) beneficial use. The MUN use designation was removed in Basin Plan amendments that took effect in 2002. The rationale for removing the use included naturally high salinity and levels of toxic substances such as arsenic, and fluctuating water quantity that would make the river an unreliable supply if treatment were feasible. The perennial reaches of the Amargosa River and the associated riparian areas support a complex of rare, threatened or endangered fish and wildlife species. To Lahontan Water Board staffs knowledge, there are no salmonids in the river and there is no warm water fishery for human consumption.
QAPP Information: | The data meet the quality assurance requirements of the SWAMP QAPP.
QAPP Information Reference(s):
Line of Evidence (LOE) for Decision ID 24544, Lead | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)
LOE ID: | 24934
Pollutant: | Lead
LOE Subgroup: | Pollutant-Sediment
Matrix: | Sediment
Fraction: | None
Beneficial Use: | Inland Saline Water Habitat
Number of Samples: | 1
Number of Exceedances: | 0
Data and Information Type: | Chemical monitoring of sediments
Data Used to Assess Water Quality: | The U.S. Geological Survey sampled sediment at this station on March 16, 2005 under the Region 6 SWAMP program. Results were reported as "bed sediment, smaller than 62.5 um, wet sieved, total digestion." The concentration of lead was 28 ug/g dry weight.
Data Reference: | 2007. SWAMP Data for the Amargosa Hydrologic Unit
SWAMP Data: | SWAMP
Water Quality Objective/Criterion: | There are no state or federal standards or criteria for lead in sediment in inland saline waters. The Probable Effects Level for lead in marine and estuarine sediments is 112.18 ug/g dry weight; see MacDonald et al. (1996).
Objective/Criterion Reference: | Development and evaluation of sediment quality guidelines for Florida coastal waters. Ecotoxicology 5: 253-278
| Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | One station, Amargosa River below Willow Creek, was sampled.
Temporal Representation: | One sediment sample was collected on March 16, 2005.
Environmental Conditions: | The Amargosa River flows into California from Nevada and terminates in Death Valley. It is mostly ephemeral but there are perennial reaches. There is great seasonal and annual variability in flows. Most of the watershed is U.S. Bureau of Land Management or National Park land. The Amargosa River is not designated for the Municipal and Domestic Supply (MUN) beneficial use. The MUN use designation was removed in Basin Plan amendments that took effect in 2002. The rationale for removing the use included naturally high salinity and levels of toxic substances such as arsenic, and fluctuating water quantity that would make the river an unreliable supply if treatment were feasible. The perennial reaches of the Amargosa River and the associated riparian areas support a complex of rare, threatened or endangered fish and wildlife species. To Lahontan Water Board staffs knowledge, there are no salmonids in the river and there is no warm water fishery for human consumption.
QAPP Information: | The data meet the quality assurance requirements of the SWAMP QAPP.
QAPP Information Reference(s):

DECISION ID | 24048 | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)

Pollutant: | Lithium
Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)(2010)
Revision Status | Revised
Impairment from Pollutant or Pollution: | Pollutant
Regional Board Staff Conclusion: | The LOE was incorrectly assigned to the waterbody so there is no data available for this waterbody/pollutant combination. The mapped representation of this waterbody was corrected this cycle. This decision is being decommissioned (to be retired next cycle) while a copy of it as a "Do Not List" now lives with the new mapped representation of this waterbody.
Regional Board Staff Decision Recommendation: |

Line of Evidence (LOE) for Decision ID 24048, Lithium | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)
LOE ID: | 24907
Pollutant: | Lithium
LOE Subgroup: | Pollutant-Sediment
Matrix: | Sediment
Fraction: | None
Beneficial Use: | Inland Saline Water Habitat
Number of Samples: | 1
Number of Exceedances: | 0
Data and Information Type: | Chemical monitoring of sediments
Data Used to Assess Water Quality: | The U.S. Geological Survey sampled sediment at this station on March 16, 2005 under the Region 6 SWAMP program. Results were reported as "bed sediment, smaller than 62.5 um, wet sieved, total digestion." The concentration of lithium was 33 ug/g dry weight.
Data Reference: | 2007. SWAMP Data for the Amargosa Hydrologic Unit
SWAMP Data: | SWAMP
Water Quality Objective/Criterion: | There are no state or federal standards or criteria for lithium in sediment in inland saline waters.
Objective/Criterion Reference: | Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | One station, Amargosa River below Willow Creek, was sampled.
Temporal Representation: | One sediment sample was collected on March 16, 2005.
Environmental Conditions: | The Amargosa River flows into California from Nevada and terminates in Death Valley. It is mostly ephemeral but there are perennial reaches. There is great seasonal and annual variability in flows. Most of the watershed is U.S. Bureau of Land Management or National Park land. The Amargosa River is not designated for the Municipal and Domestic Supply (MUN) beneficial use. The MUN use designation was removed in Basin Plan amendments that took effect in 2002. The rationale for removing the use included naturally high salinity and levels of toxic substances such as arsenic, and fluctuating water quantity that would make the river an unreliable supply if treatment were feasible. The perennial reaches of the Amargosa River and the associated riparian areas support a complex of rare, threatened or endangered fish and wildlife species. To Lahontan Water Board staffs knowledge, there are no salmonids in the river and there is no warm water fishery for human consumption.
QAPP Information: | The data meet the quality assurance requirements of the SWAMP QAPP.
QAPP Information Reference(s):

DECISION ID | 24401 | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)

Pollutant: | Magnesium
Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)(2010)
Revision Status | Revised
Impairment from Pollutant or Pollution: | Pollutant
Regional Board Staff Conclusion: | The LOE was incorrectly assigned to the waterbody so there is no data available for this waterbody/pollutant combination. The mapped representation of this waterbody was corrected this cycle. This decision is being decommissioned (to be retired next cycle) while a copy of it as a "Do Not List" now lives with the new mapped representation of this waterbody.
Regional Board Staff Decision Recommendation: |

Line of Evidence (LOE) for Decision ID 24401, Magnesium | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)
LOE ID: | 25200
Pollutant: | Magnesium
LOE Subgroup: | Pollutant-Water
Matrix: | Water
Fraction: | Total
Beneficial Use: | Inland Saline Water Habitat
Number of Samples: | 2
Number of Exceedances: | 0
Data and Information Type: | Fixed station physical/chemical (conventional plus toxic pollutants)
Data Used to Assess Water Quality: | The U.S. Geological Survey sampled this station on on March 18, 2004 and March 16, 2005 under the Region 6 SWAMP program. Two samples had total magnesium concentrations of 44.1 and 57.5 mg/L.
Data Reference: | 2007. SWAMP Data for the Amargosa Hydrologic Unit
SWAMP Data: | SWAMP
Water Quality Objective/Criterion: | There are no applicable state or federal standards or criteria for total magnesium in inland saline waters.
Objective/Criterion Reference: | Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | One station, Amargosa River below Willow Creek, was sampled.
Temporal Representation: | Two samples were collected on March 18, 2004 and March 16, 2005.
Environmental Conditions: | The Amargosa River flows into California from Nevada and terminates in Death Valley. It is mostly ephemeral but there are perennial reaches. There is great seasonal and annual variability in flows. Most of the watershed is U.S. Bureau of Land Management or National Park land. The Amargosa River is not designated for the Municipal and Domestic Supply (MUN) beneficial use. The MUN use designation was removed in Basin Plan amendments that took effect in 2002. The rationale for removing the use included naturally high salinity and levels of toxic substances such as arsenic, and fluctuating water quantity that would make the river an unreliable supply if treatment were feasible. The perennial reaches of the Amargosa River and the associated riparian areas support a complex of rare, threatened or endangered fish and wildlife species. To Lahontan Water Board staffs knowledge, there are no salmonids in the river and there is no warm water fishery for human consumption.
QAPP Information: | The data meet the quality assurance requirements of the SWAMP QAPP.
QAPP Information Reference(s):
Line of Evidence (LOE) for Decision ID 24401, Magnesium | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)
LOE ID: | 24926
Pollutant: | Magnesium
LOE Subgroup: | Pollutant-Sediment
Matrix: | Sediment
Fraction: | None
Beneficial Use: | Inland Saline Water Habitat
Number of Samples: | 1
Number of Exceedances: | 0
Data and Information Type: | Chemical monitoring of sediments
Data Used to Assess Water Quality: | The U.S. Geological Survey sampled sediment at this station on March 16, 2005 under the Region 6 SWAMP program. Results were reported as "bed sediment, smaller than 62.5 um, wet sieved, total digestion." The concentration of magnesium was 0.98 percent dry weight.
Data Reference: | 2007. SWAMP Data for the Amargosa Hydrologic Unit
SWAMP Data: | SWAMP
Water Quality Objective/Criterion: | There are no state or federal standards or criteria for magnesium in sediment in inland saline waters.
Objective/Criterion Reference: | Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | One station, Amargosa River below Willow Creek, was sampled.
Temporal Representation: | One sediment sample was collected on March 16, 2005.
Environmental Conditions: | The Amargosa River flows into California from Nevada and terminates in Death Valley. It is mostly ephemeral but there are perennial reaches. There is great seasonal and annual variability in flows. Most of the watershed is U.S. Bureau of Land Management or National Park land. The Amargosa River is not designated for the Municipal and Domestic Supply (MUN) beneficial use. The MUN use designation was removed in Basin Plan amendments that took effect in 2002. The rationale for removing the use included naturally high salinity and levels of toxic substances such as arsenic, and fluctuating water quantity that would make the river an unreliable supply if treatment were feasible. The perennial reaches of the Amargosa River and the associated riparian areas support a complex of rare, threatened or endangered fish and wildlife species. To Lahontan Water Board staffs knowledge, there are no salmonids in the river and there is no warm water fishery for human consumption.
QAPP Information: | The data meet the quality assurance requirements of the SWAMP QAPP.
QAPP Information Reference(s):
Line of Evidence (LOE) for Decision ID 24401, Magnesium | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)
LOE ID: | 25202
Pollutant: | Magnesium
LOE Subgroup: | Pollutant-Water
Matrix: | Water
Fraction: | Dissolved
Beneficial Use: | Inland Saline Water Habitat
Number of Samples: | 2
Number of Exceedances: | 0
Data and Information Type: | Fixed station physical/chemical (conventional plus toxic pollutants)
Data Used to Assess Water Quality: | The U.S. Geological Survey sampled this station on on March 18, 2004 and March 16, 2005 under the Region 6 SWAMP program. Two samples had dissolved magnesium concentrations of 35.and 53.4 mg/L.
Data Reference: | 2007. SWAMP Data for the Amargosa Hydrologic Unit
SWAMP Data: | SWAMP
Water Quality Objective/Criterion: | There are no applicable state or federal standards or criteria for total magnesium in inland saline waters.
Objective/Criterion Reference: | Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | One station, Amargosa River below Willow Creek, was sampled.
Temporal Representation: | Two samples were collected on March 18, 2004 and March 16, 2005.
Environmental Conditions: | The Amargosa River flows into California from Nevada and terminates in Death Valley. It is mostly ephemeral but there are perennial reaches. There is great seasonal and annual variability in flows. Most of the watershed is U.S. Bureau of Land Management or National Park land. The Amargosa River is not designated for the Municipal and Domestic Supply (MUN) beneficial use. The MUN use designation was removed in Basin Plan amendments that took effect in 2002. The rationale for removing the use included naturally high salinity and levels of toxic substances such as arsenic, and fluctuating water quantity that would make the river an unreliable supply if treatment were feasible. The perennial reaches of the Amargosa River and the associated riparian areas support a complex of rare, threatened or endangered fish and wildlife species. To Lahontan Water Board staffs knowledge, there are no salmonids in the river and there is no warm water fishery for human consumption.
QAPP Information: | The data meet the quality assurance requirements of the SWAMP QAPP.
QAPP Information Reference(s):

DECISION ID | 24545 | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)

Pollutant: | Manganese
Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)(2010)
Revision Status | Revised
Impairment from Pollutant or Pollution: | Pollutant
Regional Board Staff Conclusion: | The LOE was incorrectly assigned to the waterbody so there is no data available for this waterbody/pollutant combination. The mapped representation of this waterbody was corrected this cycle. This decision is being decommissioned (to be retired next cycle) while a copy of it as a "Do Not List" now lives with the new mapped representation of this waterbody.
Regional Board Staff Decision Recommendation: |

Line of Evidence (LOE) for Decision ID 24545, Manganese | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)
LOE ID: | 24908
Pollutant: | Manganese
LOE Subgroup: | Pollutant-Sediment
Matrix: | Sediment
Fraction: | None
Beneficial Use: | Inland Saline Water Habitat
Number of Samples: | 1
Number of Exceedances: | 0
Data and Information Type: | Chemical monitoring of sediments
Data Used to Assess Water Quality: | The U.S. Geological Survey sampled sediment at this station on March 16, 2005 under the Region 6 SWAMP program. Results were reported as "bed sediment, smaller than 62.5 um, wet sieved, total digestion." The concentration of manganese was 490 ug/g dry weight.
Data Reference: | 2007. SWAMP Data for the Amargosa Hydrologic Unit
SWAMP Data: | SWAMP
Water Quality Objective/Criterion: | There are no state or federal standards or criteria for manganese in sediment in inland saline waters.
Objective/Criterion Reference: | Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | One station, Amargosa River below Willow Creek, was sampled.
Temporal Representation: | One sediment sample was collected on March 16, 2005.
Environmental Conditions: | The Amargosa River flows into California from Nevada and terminates in Death Valley. It is mostly ephemeral but there are perennial reaches. There is great seasonal and annual variability in flows. Most of the watershed is U.S. Bureau of Land Management or National Park land. The Amargosa River is not designated for the Municipal and Domestic Supply (MUN) beneficial use. The MUN use designation was removed in Basin Plan amendments that took effect in 2002. The rationale for removing the use included naturally high salinity and levels of toxic substances such as arsenic, and fluctuating water quantity that would make the river an unreliable supply if treatment were feasible. The perennial reaches of the Amargosa River and the associated riparian areas support a complex of rare, threatened or endangered fish and wildlife species. To Lahontan Water Board staffs knowledge, there are no salmonids in the river and there is no warm water fishery for human consumption.
QAPP Information: | The data meet the quality assurance requirements of the SWAMP QAPP.
QAPP Information Reference(s):
Line of Evidence (LOE) for Decision ID 24545, Manganese | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)
LOE ID: | 25078
Pollutant: | Manganese
LOE Subgroup: | Pollutant-Water
Matrix: | Water
Fraction: | Dissolved
Beneficial Use: | Inland Saline Water Habitat
Number of Samples: | 2
Number of Exceedances: | 0
Data and Information Type: | Fixed station physical/chemical (conventional plus toxic pollutants)
Data Used to Assess Water Quality: | The U.S. Geological Survey sampled this station on on March 18, 2004 and March 16, 2005 under the Region 6 SWAMP program. Concentrations of dissolved manganese in two samples were 49.8 and 153 ug/L.
Data Reference: | 2007. SWAMP Data for the Amargosa Hydrologic Unit
SWAMP Data: | SWAMP
Water Quality Objective/Criterion: | There are no applicable state or federal saltwater aquatic life standards or criteria for dissolved manganese in inland saline waters.
Objective/Criterion Reference: | Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | One station, Amargosa River below Willow Creek, was sampled.
Temporal Representation: | Two samples were collected on March 18, 2004 and March 16, 2005.
Environmental Conditions: | The Amargosa River flows into California from Nevada and terminates in Death Valley. It is mostly ephemeral but there are perennial reaches. There is great seasonal and annual variability in flows. Most of the watershed is U.S. Bureau of Land Management or National Park land. The Amargosa River is not designated for the Municipal and Domestic Supply (MUN) beneficial use. The MUN use designation was removed in Basin Plan amendments that took effect in 2002. The rationale for removing the use included naturally high salinity and levels of toxic substances such as arsenic, and fluctuating water quantity that would make the river an unreliable supply if treatment were feasible. The perennial reaches of the Amargosa River and the associated riparian areas support a complex of rare, threatened or endangered fish and wildlife species. To Lahontan Water Board staffs knowledge, there are no salmonids in the river and there is no warm water fishery for human consumption.
QAPP Information: | The data meet the quality assurance requirements of the SWAMP QAPP.
QAPP Information Reference(s):
Line of Evidence (LOE) for Decision ID 24545, Manganese | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)
LOE ID: | 25077
Pollutant: | Manganese
LOE Subgroup: | Pollutant-Water
Matrix: | Water
Fraction: | Total
Beneficial Use: | Inland Saline Water Habitat
Number of Samples: | 2
Number of Exceedances: | 0
Data and Information Type: | Fixed station physical/chemical (conventional plus toxic pollutants)
Data Used to Assess Water Quality: | The U.S. Geological Survey sampled this station on on March 18, 2004 and March 16, 2005 under the Region 6 SWAMP program. Concentrations of total manganese in two samples were 70 and 175 ug/L.
Data Reference: | 2007. SWAMP Data for the Amargosa Hydrologic Unit
SWAMP Data: | SWAMP
Water Quality Objective/Criterion: | There are no applicable state or federal saltwater aquatic life standards or criteria for total manganese in inland saline waters.
Objective/Criterion Reference: | Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | One station, Amargosa River below Willow Creek, was sampled.
Temporal Representation: | Two samples were collected on March 18, 2004 and March 16, 2005.
Environmental Conditions: | The Amargosa River flows into California from Nevada and terminates in Death Valley. It is mostly ephemeral but there are perennial reaches. There is great seasonal and annual variability in flows. Most of the watershed is U.S. Bureau of Land Management or National Park land. The Amargosa River is not designated for the Municipal and Domestic Supply (MUN) beneficial use. The MUN use designation was removed in Basin Plan amendments that took effect in 2002. The rationale for removing the use included naturally high salinity and levels of toxic substances such as arsenic, and fluctuating water quantity that would make the river an unreliable supply if treatment were feasible. The perennial reaches of the Amargosa River and the associated riparian areas support a complex of rare, threatened or endangered fish and wildlife species. To Lahontan Water Board staffs knowledge, there are no salmonids in the river and there is no warm water fishery for human consumption.
QAPP Information: | The data meet the quality assurance requirements of the SWAMP QAPP.
QAPP Information Reference(s):

DECISION ID | 24458 | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)

Pollutant: | Mercury
Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)(2010)
Revision Status | Revised
Impairment from Pollutant or Pollution: | Pollutant
Regional Board Staff Conclusion: | The LOE was incorrectly assigned to the waterbody so there is no data available for this waterbody/pollutant combination. The mapped representation of this waterbody was corrected this cycle. This decision is being decommissioned (to be retired next cycle) while a copy of it as a "Do Not List" now lives with the new mapped representation of this waterbody.
Regional Board Staff Decision Recommendation: | This decision is being decommissioned (to be retired next cycle) while a copy of it as a "Do Not List" now lives with the new mapped representation of this waterbody.

Line of Evidence (LOE) for Decision ID 24458, Mercury | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)
LOE ID: | 24935
Pollutant: | Mercury
LOE Subgroup: | Pollutant-Sediment
Matrix: | Sediment
Fraction: | None
Beneficial Use: | Inland Saline Water Habitat
Number of Samples: | 1
Number of Exceedances: | 0
Data and Information Type: | Chemical monitoring of sediments
Data Used to Assess Water Quality: | The U.S. Geological Survey sampled sediment at this station on March 16, 2005 under the Region 6 SWAMP program. Results were reported as "bed sediment, smaller than 62.5 um, wet sieved, total digestion." The concentration of mercury was below the detection level.
Data Reference: | 2007. SWAMP Data for the Amargosa Hydrologic Unit
SWAMP Data: | SWAMP
Water Quality Objective/Criterion: | There are no state or federal standards or criteria for mercury in sediment in inland saline waters.
Objective/Criterion Reference: | Pollutants of concern in Puget Sound. EPA 910/9-91-003. Seattle, WA: U.S. Environmental Protection Agency
| Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | One station, Amargosa River below Willow Creek, was sampled.
Temporal Representation: | One sediment sample was collected on March 16, 2005.
Environmental Conditions: | The Amargosa River flows into California from Nevada and terminates in Death Valley. It is mostly ephemeral but there are perennial reaches. There is great seasonal and annual variability in flows. Most of the watershed is U.S. Bureau of Land Management or National Park land. The Amargosa River is not designated for the Municipal and Domestic Supply (MUN) beneficial use. The MUN use designation was removed in Basin Plan amendments that took effect in 2002. The rationale for removing the use included naturally high salinity and levels of toxic substances such as arsenic, and fluctuating water quantity that would make the river an unreliable supply if treatment were feasible. The perennial reaches of the Amargosa River and the associated riparian areas support a complex of rare, threatened or endangered fish and wildlife species. To Lahontan Water Board staffs knowledge, there are no salmonids in the river and there is no warm water fishery for human consumption.
QAPP Information: | The data meet the quality assurance requirements of the SWAMP QAPP.
QAPP Information Reference(s):
Line of Evidence (LOE) for Decision ID 24458, Mercury | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)
LOE ID: | 25083
Pollutant: | Mercury
LOE Subgroup: | Pollutant-Water
Matrix: | Water
Fraction: | Total
Beneficial Use: | Inland Saline Water Habitat
Number of Samples: | 2
Number of Exceedances: | 0
Data and Information Type: | Fixed station physical/chemical (conventional plus toxic pollutants)
Data Used to Assess Water Quality: | The U.S. Geological Survey sampled this station on on March 18, 2004 and March 16, 2005 under the Region 6 SWAMP program. One of two samples for total mercury was below the detection level and the concentration in the other was an estimated value.
Data Reference: | 2007. SWAMP Data for the Amargosa Hydrologic Unit
SWAMP Data: | SWAMP
Water Quality Objective/Criterion: | There are no state or federal standards or criteria for mercury for the protection of aquatic life in inland saline waters.
Objective/Criterion Reference: | Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | One station, Amargosa River below Willow Creek, was sampled.
Temporal Representation: | Two samples were collected on March 18, 2004 and March 16, 2005.
Environmental Conditions: | The Amargosa River flows into California from Nevada and terminates in Death Valley. It is mostly ephemeral but there are perennial reaches. There is great seasonal and annual variability in flows. Most of the watershed is U.S. Bureau of Land Management or National Park land. The Amargosa River is not designated for the Municipal and Domestic Supply (MUN) beneficial use. The MUN use designation was removed in Basin Plan amendments that took effect in 2002. The rationale for removing the use included naturally high salinity and levels of toxic substances such as arsenic, and fluctuating water quantity that would make the river an unreliable supply if treatment were feasible. The perennial reaches of the Amargosa River and the associated riparian areas support a complex of rare, threatened or endangered fish and wildlife species. To Lahontan Water Board staffs knowledge, there are no salmonids in the river and there is no warm water fishery for human consumption.
QAPP Information: | The data meet the quality assurance requirements of the SWAMP QAPP.
QAPP Information Reference(s):
Line of Evidence (LOE) for Decision ID 24458, Mercury | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)
LOE ID: | 25082
Pollutant: | Mercury
LOE Subgroup: | Pollutant-Water
Matrix: | Water
Fraction: | Dissolved
Beneficial Use: | Inland Saline Water Habitat
Number of Samples: | 2
Number of Exceedances: | 0
Data and Information Type: | Fixed station physical/chemical (conventional plus toxic pollutants)
Data Used to Assess Water Quality: | The U.S. Geological Survey sampled this station on on March 18, 2004 and March 16, 2005 under the Region 6 SWAMP program. One of two samples for dissolved mercury was below the detection level and the concentration in the other was an estimated value.
Data Reference: | 2007. SWAMP Data for the Amargosa Hydrologic Unit
SWAMP Data: | SWAMP
Water Quality Objective/Criterion: | There are no applicable state or federal saltwater aquatic life standards or criteria for dissolved mercury in inland saline waters.
Objective/Criterion Reference: | Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | One station, Amargosa River below Willow Creek, was sampled.
Temporal Representation: | Two samples were collected on March 18, 2004 and March 16, 2005.
Environmental Conditions: | The Amargosa River flows into California from Nevada and terminates in Death Valley. It is mostly ephemeral but there are perennial reaches. There is great seasonal and annual variability in flows. Most of the watershed is U.S. Bureau of Land Management or National Park land. The Amargosa River is not designated for the Municipal and Domestic Supply (MUN) beneficial use. The MUN use designation was removed in Basin Plan amendments that took effect in 2002. The rationale for removing the use included naturally high salinity and levels of toxic substances such as arsenic, and fluctuating water quantity that would make the river an unreliable supply if treatment were feasible. The perennial reaches of the Amargosa River and the associated riparian areas support a complex of rare, threatened or endangered fish and wildlife species. To Lahontan Water Board staffs knowledge, there are no salmonids in the river and there is no warm water fishery for human consumption.
QAPP Information: | The data meet the quality assurance requirements of the SWAMP QAPP.
QAPP Information Reference(s):

DECISION ID | 24546 | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)

Pollutant: | Molybdenum
Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)(2010)
Revision Status | Revised
Impairment from Pollutant or Pollution: | Pollutant
Regional Board Staff Conclusion: | The LOE was incorrectly assigned to the waterbody so there is no data available for this waterbody/pollutant combination. The mapped representation of this waterbody was corrected this cycle. This decision is being decommissioned (to be retired next cycle) while a copy of it as a "Do Not List" now lives with the new mapped representation of this waterbody.
Regional Board Staff Decision Recommendation: |

Line of Evidence (LOE) for Decision ID 24546, Molybdenum | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)
LOE ID: | 25084
Pollutant: | Molybdenum
LOE Subgroup: | Pollutant-Water
Matrix: | Water
Fraction: | Dissolved
Beneficial Use: | Inland Saline Water Habitat
Number of Samples: | 2
Number of Exceedances: | 0
Data and Information Type: | Fixed station physical/chemical (conventional plus toxic pollutants)
Data Used to Assess Water Quality: | The U.S. Geological Survey sampled this station on on March 18, 2004 and March 16, 2005 under the Region 6 SWAMP program. Concentrations of dissolved molybdenum in two samples were 49.6 and 57.5 ug/L.
Data Reference: | 2007. SWAMP Data for the Amargosa Hydrologic Unit
SWAMP Data: | SWAMP
Water Quality Objective/Criterion: | There are no applicable state or federal saltwater aquatic life standards or criteria for dissolved molybdenum in inland saline waters.
Objective/Criterion Reference: | Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | One station, Amargosa River below Willow Creek, was sampled.
Temporal Representation: | Two samples were collected on March 18, 2004 and March 16, 2005.
Environmental Conditions: | The Amargosa River flows into California from Nevada and terminates in Death Valley. It is mostly ephemeral but there are perennial reaches. There is great seasonal and annual variability in flows. Most of the watershed is U.S. Bureau of Land Management or National Park land. The Amargosa River is not designated for the Municipal and Domestic Supply (MUN) beneficial use. The MUN use designation was removed in Basin Plan amendments that took effect in 2002. The rationale for removing the use included naturally high salinity and levels of toxic substances such as arsenic, and fluctuating water quantity that would make the river an unreliable supply if treatment were feasible. The perennial reaches of the Amargosa River and the associated riparian areas support a complex of rare, threatened or endangered fish and wildlife species. To Lahontan Water Board staffs knowledge, there are no salmonids in the river and there is no warm water fishery for human consumption.
QAPP Information: | The data meet the quality assurance requirements of the SWAMP QAPP.
QAPP Information Reference(s):
Line of Evidence (LOE) for Decision ID 24546, Molybdenum | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)
LOE ID: | 24909
Pollutant: | Molybdenum
LOE Subgroup: | Pollutant-Sediment
Matrix: | Sediment
Fraction: | None
Beneficial Use: | Inland Saline Water Habitat
Number of Samples: | 1
Number of Exceedances: | 0
Data and Information Type: | Chemical monitoring of sediments
Data Used to Assess Water Quality: | The U.S. Geological Survey sampled sediment at this station on March 16, 2005 under the Region 6 SWAMP program. Results were reported as "bed sediment, smaller than 62.5 um, wet sieved, total digestion." The concentration of molybdenum was 2.1 ug/g dry weight.
Data Reference: | 2007. SWAMP Data for the Amargosa Hydrologic Unit
SWAMP Data: | SWAMP
Water Quality Objective/Criterion: | There are no state or federal standards or criteria for molybdenum in sediment in inland saline waters.
Objective/Criterion Reference: | Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | One station, Amargosa River below Willow Creek, was sampled.
Temporal Representation: | One sediment sample was collected on March 16, 2005.
Environmental Conditions: | The Amargosa River flows into California from Nevada and terminates in Death Valley. It is mostly ephemeral but there are perennial reaches. There is great seasonal and annual variability in flows. Most of the watershed is U.S. Bureau of Land Management or National Park land. The Amargosa River is not designated for the Municipal and Domestic Supply (MUN) beneficial use. The MUN use designation was removed in Basin Plan amendments that took effect in 2002. The rationale for removing the use included naturally high salinity and levels of toxic substances such as arsenic, and fluctuating water quantity that would make the river an unreliable supply if treatment were feasible. The perennial reaches of the Amargosa River and the associated riparian areas support a complex of rare, threatened or endangered fish and wildlife species. To Lahontan Water Board staffs knowledge, there are no salmonids in the river and there is no warm water fishery for human consumption.
QAPP Information: | The data meet the quality assurance requirements of the SWAMP QAPP.
QAPP Information Reference(s):
Line of Evidence (LOE) for Decision ID 24546, Molybdenum | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)
LOE ID: | 25085
Pollutant: | Molybdenum
LOE Subgroup: | Pollutant-Water
Matrix: | Water
Fraction: | Total
Beneficial Use: | Inland Saline Water Habitat
Number of Samples: | 2
Number of Exceedances: | 0
Data and Information Type: | Fixed station physical/chemical (conventional plus toxic pollutants)
Data Used to Assess Water Quality: | The U.S. Geological Survey sampled this station on on March 18, 2004 and March 16, 2005 under the Region 6 SWAMP program. Concentrations of total molybdenum in two samples were 48.1 and 57.7 ug/L.
Data Reference: | 2007. SWAMP Data for the Amargosa Hydrologic Unit
SWAMP Data: | SWAMP
Water Quality Objective/Criterion: | There are no applicable state or federal saltwater aquatic life standards or criteria for total molybdenum in inland saline waters.
Objective/Criterion Reference: | Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | One station, Amargosa River below Willow Creek, was sampled.
Temporal Representation: | Two samples were collected on March 18, 2004 and March 16, 2005.
Environmental Conditions: | The Amargosa River flows into California from Nevada and terminates in Death Valley. It is mostly ephemeral but there are perennial reaches. There is great seasonal and annual variability in flows. Most of the watershed is U.S. Bureau of Land Management or National Park land. The Amargosa River is not designated for the Municipal and Domestic Supply (MUN) beneficial use. The MUN use designation was removed in Basin Plan amendments that took effect in 2002. The rationale for removing the use included naturally high salinity and levels of toxic substances such as arsenic, and fluctuating water quantity that would make the river an unreliable supply if treatment were feasible. The perennial reaches of the Amargosa River and the associated riparian areas support a complex of rare, threatened or endangered fish and wildlife species. To Lahontan Water Board staffs knowledge, there are no salmonids in the river and there is no warm water fishery for human consumption.
QAPP Information: | The data meet the quality assurance requirements of the SWAMP QAPP.
QAPP Information Reference(s):

DECISION ID | 25058 | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)

Pollutant: | Neodymium
Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)(2010)
Revision Status | Revised
Impairment from Pollutant or Pollution: | Pollutant
Regional Board Staff Conclusion: | The LOE was incorrectly assigned to the waterbody so there is no data available for this waterbody/pollutant combination. The mapped representation of this waterbody was corrected this cycle. This decision is being decommissioned (to be retired next cycle) while a copy of it as a "Do Not List" now lives with the new mapped representation of this waterbody.
Regional Board Staff Decision Recommendation: | The mapped representation of this waterbody was corrected this cycle. This decision is being decommissioned (to be retired next cycle) while a copy of it as a "Do Not List" now lives with the new mapped representation of this waterbody which is Amargosa River (Willow Creek Confluence to Badwater).

Line of Evidence (LOE) for Decision ID 25058, Neodymium | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)
LOE ID: | 24910
Pollutant: | Neodymium
LOE Subgroup: | Pollutant-Sediment
Matrix: | Sediment
Fraction: | None
Beneficial Use: | Inland Saline Water Habitat
Number of Samples: | 1
Number of Exceedances: | 0
Data and Information Type: | Chemical monitoring of sediments
Data Used to Assess Water Quality: | The U.S. Geological Survey sampled sediment at this station on March 16, 2005 under the Region 6 SWAMP program. Results were reported as "bed sediment, smaller than 62.5 um, wet sieved, total digestion." The concentration of neodymium was 33 ug/g dry weight.
Data Reference: | 2007. SWAMP Data for the Amargosa Hydrologic Unit
SWAMP Data: | SWAMP
Water Quality Objective/Criterion: | There are no state or federal standards or criteria for neodymium in sediment in inland saline waters.
Objective/Criterion Reference: | Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | One station, Amargosa River below Willow Creek, was sampled.
Temporal Representation: | One sediment sample was collected on March 16, 2005.
Environmental Conditions: | The Amargosa River flows into California from Nevada and terminates in Death Valley. It is mostly ephemeral but there are perennial reaches. There is great seasonal and annual variability in flows. Most of the watershed is U.S. Bureau of Land Management or National Park land. The Amargosa River is not designated for the Municipal and Domestic Supply (MUN) beneficial use. The MUN use designation was removed in Basin Plan amendments that took effect in 2002. The rationale for removing the use included naturally high salinity and levels of toxic substances such as arsenic, and fluctuating water quantity that would make the river an unreliable supply if treatment were feasible. The perennial reaches of the Amargosa River and the associated riparian areas support a complex of rare, threatened or endangered fish and wildlife species. To Lahontan Water Board staffs knowledge, there are no salmonids in the river and there is no warm water fishery for human consumption.
QAPP Information: | The data meet the quality assurance requirements of the SWAMP QAPP.
QAPP Information Reference(s):

DECISION ID | 24557 | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)

Pollutant: | Nickel
Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)(2010)
Revision Status | Revised
Impairment from Pollutant or Pollution: | Pollutant
Regional Board Staff Conclusion: | The LOE was incorrectly assigned to the waterbody so there is no data available for this waterbody/pollutant combination. The mapped representation of this waterbody was corrected this cycle. This decision is being decommissioned (to be retired next cycle) while a copy of it as a "Do Not List" now lives with the new mapped representation of this waterbody.
Regional Board Staff Decision Recommendation: | The mapped representation of this waterbody was corrected this cycle. This decision is being decommissioned (to be retired next cycle) while a copy of it as a "Do Not List" now lives with the new mapped representation of this waterbody which is Amargosa River (Willow Creek Confluence to Badwater).

Line of Evidence (LOE) for Decision ID 24557, Nickel | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)
LOE ID: | 25087
Pollutant: | Nickel
LOE Subgroup: | Pollutant-Water
Matrix: | Water
Fraction: | Dissolved
Beneficial Use: | Inland Saline Water Habitat
Number of Samples: | 2
Number of Exceedances: | 0
Data and Information Type: | Fixed station physical/chemical (conventional plus toxic pollutants)
Data Used to Assess Water Quality: | The U.S. Geological Survey sampled this station on on March 18, 2004 and March 16, 2005 under the Region 6 SWAMP program. Concentrations of dissolved nickel in two samples were 1.32 and 1.52 ug/L.
Data Reference: | 2007. SWAMP Data for the Amargosa Hydrologic Unit
SWAMP Data: | SWAMP
Water Quality Objective/Criterion: | The California Toxics Rule's saltwater aquatic life standards for dissolved nickel include an acute toxicity limit of 74 ug/L and a achronic toxicity limit of 8.2 ug/L.
Objective/Criterion Reference: | Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | One station, Amargosa River below Willow Creek, was sampled.
Temporal Representation: | Two samples were collected on March 18, 2004 and March 16, 2005.
Environmental Conditions: | The Amargosa River flows into California from Nevada and terminates in Death Valley. It is mostly ephemeral but there are perennial reaches. There is great seasonal and annual variability in flows. Most of the watershed is U.S. Bureau of Land Management or National Park land. The Amargosa River is not designated for the Municipal and Domestic Supply (MUN) beneficial use. The MUN use designation was removed in Basin Plan amendments that took effect in 2002. The rationale for removing the use included naturally high salinity and levels of toxic substances such as arsenic, and fluctuating water quantity that would make the river an unreliable supply if treatment were feasible. The perennial reaches of the Amargosa River and the associated riparian areas support a complex of rare, threatened or endangered fish and wildlife species. To Lahontan Water Board staffs knowledge, there are no salmonids in the river and there is no warm water fishery for human consumption.
QAPP Information: | The data meet the quality assurance requirements of the SWAMP QAPP.
QAPP Information Reference(s):
Line of Evidence (LOE) for Decision ID 24557, Nickel | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)
LOE ID: | 24936
Pollutant: | Nickel
LOE Subgroup: | Pollutant-Sediment
Matrix: | Sediment
Fraction: | None
Beneficial Use: | Inland Saline Water Habitat
Number of Samples: | 1
Number of Exceedances: | 0
Data and Information Type: | Chemical monitoring of sediments
Data Used to Assess Water Quality: | The U.S. Geological Survey sampled sediment at this station on March 16, 2005 under the Region 6 SWAMP program. Results were reported as "bed sediment, smaller than 62.5 um, wet sieved, total digestion." The concentration of nickel was 9 ug/g dry weight.
Data Reference: | 2007. SWAMP Data for the Amargosa Hydrologic Unit
SWAMP Data: | SWAMP
Water Quality Objective/Criterion: | There are no state or federal standards or criteria for nickel in sediment in inland saline waters.
Objective/Criterion Reference: | Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | One station, Amargosa River below Willow Creek, was sampled.
Temporal Representation: | One sediment sample was collected on March 16, 2005.
Environmental Conditions: | The Amargosa River flows into California from Nevada and terminates in Death Valley. It is mostly ephemeral but there are perennial reaches. There is great seasonal and annual variability in flows. Most of the watershed is U.S. Bureau of Land Management or National Park land. The Amargosa River is not designated for the Municipal and Domestic Supply (MUN) beneficial use. The MUN use designation was removed in Basin Plan amendments that took effect in 2002. The rationale for removing the use included naturally high salinity and levels of toxic substances such as arsenic, and fluctuating water quantity that would make the river an unreliable supply if treatment were feasible. The perennial reaches of the Amargosa River and the associated riparian areas support a complex of rare, threatened or endangered fish and wildlife species. To Lahontan Water Board staffs knowledge, there are no salmonids in the river and there is no warm water fishery for human consumption.
QAPP Information: | The data meet the quality assurance requirements of the SWAMP QAPP.
QAPP Information Reference(s):
Line of Evidence (LOE) for Decision ID 24557, Nickel | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)
LOE ID: | 25086
Pollutant: | Nickel
LOE Subgroup: | Pollutant-Water
Matrix: | Water
Fraction: | Total
Beneficial Use: | Inland Saline Water Habitat
Number of Samples: | 2
Number of Exceedances: | 0
Data and Information Type: | Fixed station physical/chemical (conventional plus toxic pollutants)
Data Used to Assess Water Quality: | The U.S. Geological Survey sampled this station on on March 18, 2004 and March 16, 2005 under the Region 6 SWAMP program. Concentrations of total nickel in two samples were 2.4 and 2.75 ug/L.
Data Reference: | 2007. SWAMP Data for the Amargosa Hydrologic Unit
SWAMP Data: | SWAMP
Water Quality Objective/Criterion: | There are no applicable state or federal saltwater aquatic life standards or criteria for total nickel in inland saline waters.
Objective/Criterion Reference: | Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | One station, Amargosa River below Willow Creek, was sampled.
Temporal Representation: | Two samples were collected on March 18, 2004 and March 16, 2005.
Environmental Conditions: | The Amargosa River flows into California from Nevada and terminates in Death Valley. It is mostly ephemeral but there are perennial reaches. There is great seasonal and annual variability in flows. Most of the watershed is U.S. Bureau of Land Management or National Park land. The Amargosa River is not designated for the Municipal and Domestic Supply (MUN) beneficial use. The MUN use designation was removed in Basin Plan amendments that took effect in 2002. The rationale for removing the use included naturally high salinity and levels of toxic substances such as arsenic, and fluctuating water quantity that would make the river an unreliable supply if treatment were feasible. The perennial reaches of the Amargosa River and the associated riparian areas support a complex of rare, threatened or endangered fish and wildlife species. To Lahontan Water Board staffs knowledge, there are no salmonids in the river and there is no warm water fishery for human consumption.
QAPP Information: | The data meet the quality assurance requirements of the SWAMP QAPP.
QAPP Information Reference(s):

DECISION ID | 25185 | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)

Pollutant: | Niobium
Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)(2010)
Revision Status | Revised
Impairment from Pollutant or Pollution: | Pollutant
Regional Board Staff Conclusion: | The LOE was incorrectly assigned to the waterbody so there is no data available for this waterbody/pollutant combination. The mapped representation of this waterbody was corrected this cycle. This decision is being decommissioned (to be retired next cycle) while a copy of it as a "Do Not List" now lives with the new mapped representation of this waterbody.
Regional Board Staff Decision Recommendation: | The mapped representation of this waterbody was corrected this cycle. This decision is being decommissioned (to be retired next cycle) while a copy of it as a "Do Not List" now lives with the new mapped representation of this waterbody which is Amargosa River (Willow Creek Confluence to Badwater).

Line of Evidence (LOE) for Decision ID 25185, Niobium | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)
LOE ID: | 24911
Pollutant: | Niobium
LOE Subgroup: | Pollutant-Sediment
Matrix: | Sediment
Fraction: | None
Beneficial Use: | Inland Saline Water Habitat
Number of Samples: | 1
Number of Exceedances: | 0
Data and Information Type: | Chemical monitoring of sediments
Data Used to Assess Water Quality: | The U.S. Geological Survey sampled sediment at this station on March 16, 2005 under the Region 6 SWAMP program. Results were reported as "bed sediment, smaller than 62.5 um, wet sieved, total digestion." The concentration of niobium was 15 ug/g dry weight.
Data Reference: | 2007. SWAMP Data for the Amargosa Hydrologic Unit
SWAMP Data: | SWAMP
Water Quality Objective/Criterion: | There are no state or federal standards or criteria for niobium in sediment in inland saline waters.
Objective/Criterion Reference: | Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | One station, Amargosa River below Willow Creek, was sampled.
Temporal Representation: | One sediment sample was collected on March 16, 2005.
Environmental Conditions: | The Amargosa River flows into California from Nevada and terminates in Death Valley. It is mostly ephemeral but there are perennial reaches. There is great seasonal and annual variability in flows. Most of the watershed is U.S. Bureau of Land Management or National Park land. The Amargosa River is not designated for the Municipal and Domestic Supply (MUN) beneficial use. The MUN use designation was removed in Basin Plan amendments that took effect in 2002. The rationale for removing the use included naturally high salinity and levels of toxic substances such as arsenic, and fluctuating water quantity that would make the river an unreliable supply if treatment were feasible. The perennial reaches of the Amargosa River and the associated riparian areas support a complex of rare, threatened or endangered fish and wildlife species. To Lahontan Water Board staffs knowledge, there are no salmonids in the river and there is no warm water fishery for human consumption.
QAPP Information: | The data meet the quality assurance requirements of the SWAMP QAPP.
QAPP Information Reference(s):

DECISION ID | 24584 | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)

Pollutant: | Nitrate/Nitrite (Nitrite + Nitrate as N)
Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)(2010)
Revision Status | Revised
Impairment from Pollutant or Pollution: | Pollutant
Regional Board Staff Conclusion: | The LOE was incorrectly assigned to the waterbody so there is no data available for this waterbody/pollutant combination. The mapped representation of this waterbody was corrected this cycle. This decision is being decommissioned (to be retired next cycle) while a copy of it as a "Do Not List" now lives with the new mapped representation of this waterbody.
Regional Board Staff Decision Recommendation: | The mapped representation of this waterbody was corrected this cycle. This decision is being decommissioned (to be retired next cycle) while a copy of it as a "Do Not List" now lives with the new mapped representation of this waterbody which is Amargosa River (Willow Creek Confluence to Badwater).

Line of Evidence (LOE) for Decision ID 24584, Nitrate/Nitrite (Nitrite + Nitrate as N) | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)
LOE ID: | 25215
Pollutant: | Nitrate/Nitrite (Nitrite + Nitrate as N)
LOE Subgroup: | Pollutant-Water
Matrix: | Water
Fraction: | Dissolved
Beneficial Use: | Inland Saline Water Habitat
Number of Samples: | 2
Number of Exceedances: | 0
Data and Information Type: | Fixed station physical/chemical (conventional plus toxic pollutants)
Data Used to Assess Water Quality: | The U.S. Geological Survey sampled this station on on March 18, 2004 and March 16, 2005 under the Region 6 SWAMP program. Two samples had nitrite plus nitrate concentrations of 0.009 and 0.004 mg/L.
Data Reference: | 2007. SWAMP Data for the Amargosa Hydrologic Unit
SWAMP Data: | SWAMP
Water Quality Objective/Criterion: | There are no applicable state or federal saltwater aquatic life standards or criteria for nitrite plus nitrate. The Lahontan Basin Plan's regionwide objective for biostimulatory substances states: "Waters shall not contain biostimulatory substances in concentrations that promote aquatic growths to the extent that such growths cause nuisance or adversely affect the water for beneficial uses."
Objective/Criterion Reference: | Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | One station, Amargosa River below Willow Creek, was sampled.
Temporal Representation: | Two samples were collected on March 18, 2004 and March 16, 2005.
Environmental Conditions: | The Amargosa River flows into California from Nevada and terminates in Death Valley. It is mostly ephemeral but there are perennial reaches. There is great seasonal and annual variability in flows. Most of the watershed is U.S. Bureau of Land Management or National Park land. The Amargosa River is not designated for the Municipal and Domestic Supply (MUN) beneficial use. The MUN use designation was removed in Basin Plan amendments that took effect in 2002. The rationale for removing the use included naturally high salinity and levels of toxic substances such as arsenic, and fluctuating water quantity that would make the river an unreliable supply if treatment were feasible. The perennial reaches of the Amargosa River and the associated riparian areas support a complex of rare, threatened or endangered fish and wildlife species. To Lahontan Water Board staffs knowledge, there are no salmonids in the river and there is no warm water fishery for human consumption.
QAPP Information: | The data meet the quality assurance requirements of the SWAMP QAPP.
QAPP Information Reference(s):

DECISION ID | 24655 | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)

Pollutant: | Nitrite
Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)(2010)
Revision Status | Revised
Impairment from Pollutant or Pollution: | Pollutant
Regional Board Staff Conclusion: | The LOE was incorrectly assigned to the waterbody so there is no data available for this waterbody/pollutant combination. The mapped representation of this waterbody was corrected this cycle. This decision is being decommissioned (to be retired next cycle) while a copy of it as a "Do Not List" now lives with the new mapped representation of this waterbody.
Regional Board Staff Decision Recommendation: | The mapped representation of this waterbody was corrected this cycle. This decision is being decommissioned (to be retired next cycle) while a copy of it as a "Do Not List" now lives with the new mapped representation of this waterbody which is Amargosa River (Willow Creek Confluence to Badwater).

Line of Evidence (LOE) for Decision ID 24655, Nitrite | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)
LOE ID: | 25216
Pollutant: | Nitrite
LOE Subgroup: | Pollutant-Water
Matrix: | Water
Fraction: | Dissolved
Beneficial Use: | Inland Saline Water Habitat
Number of Samples: | 2
Number of Exceedances: | 0
Data and Information Type: | Fixed station physical/chemical (conventional plus toxic pollutants)
Data Used to Assess Water Quality: | The U.S. Geological Survey sampled this station on on March 18, 2004 and March 16, 2005 under the Region 6 SWAMP program. Two samples had nitrite concentrations of 0.002 and 0.001 mg/L.
Data Reference: | 2007. SWAMP Data for the Amargosa Hydrologic Unit
SWAMP Data: | SWAMP
Water Quality Objective/Criterion: | There are no applicable state or federal saltwater aquatic life standards or criteria for nitrite in inland saline waters. The Lahontan Basin Plan's regionwide objective for biostimulatory substances states: "Waters shall not contain biostimulatory substances in concentrations that promote aquatic growths to the extent that such growths cause nuisance or adversely affect the water for beneficial uses."
Objective/Criterion Reference: | Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | One station, Amargosa River below Willow Creek, was sampled.
Temporal Representation: | Two samples were collected on March 18, 2004 and March 16, 2005.
Environmental Conditions: | The Amargosa River flows into California from Nevada and terminates in Death Valley. It is mostly ephemeral but there are perennial reaches. There is great seasonal and annual variability in flows. Most of the watershed is U.S. Bureau of Land Management or National Park land. The Amargosa River is not designated for the Municipal and Domestic Supply (MUN) beneficial use. The MUN use designation was removed in Basin Plan amendments that took effect in 2002. The rationale for removing the use included naturally high salinity and levels of toxic substances such as arsenic, and fluctuating water quantity that would make the river an unreliable supply if treatment were feasible. The perennial reaches of the Amargosa River and the associated riparian areas support a complex of rare, threatened or endangered fish and wildlife species. To Lahontan Water Board staffs knowledge, there are no salmonids in the river and there is no warm water fishery for human consumption.
QAPP Information: | The data meet the quality assurance requirements of the SWAMP QAPP.
QAPP Information Reference(s):

DECISION ID | 28503 | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)

Pollutant: | Oxygen 18/Oxygen 16 ratio
Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)(2010)
Revision Status | Revised
Impairment from Pollutant or Pollution: | Pollutant
Regional Board Staff Conclusion: | The LOE was incorrectly assigned to the waterbody so there is no data available for this waterbody/pollutant combination. The mapped representation of this waterbody was corrected this cycle. This decision is being decommissioned (to be retired next cycle) while a copy of it as a "Do Not List" now lives with the new mapped representation of this waterbody.
Regional Board Staff Decision Recommendation: | The mapped representation of this waterbody was corrected this cycle. This decision is being decommissioned (to be retired next cycle) while a copy of it as a "Do Not List" now lives with the new mapped representation of this waterbody which is Amargosa River (Willow Creek Confluence to Badwater).

Line of Evidence (LOE) for Decision ID 28503, Oxygen 18/Oxygen 16 ratio | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)
LOE ID: | 27088
Pollutant: | Oxygen 18/Oxygen 16 ratio
LOE Subgroup: | Pollutant-Water
Matrix: | Water
Fraction: | None
Beneficial Use: | Inland Saline Water Habitat
Number of Samples: | 2
Number of Exceedances: | 0
Data and Information Type: | Fixed station physical/chemical (conventional plus toxic pollutants)
Data Used to Assess Water Quality: | The U.S. Geological Survey sampled this station on March 17, 2004 and March 15, 2005 under the Region 6 SWAMP program. The oxygen 18/oxygen 16 ratios in 2 samples were -11.62/mL and -11.64/mL.
Data Reference: | 2007. SWAMP Data for the Amargosa Hydrologic Unit
SWAMP Data: | SWAMP
Water Quality Objective/Criterion: | There are no state or federal saltwater aquatic life standards or criteria for oxygen 1/oxygen 16 ratio in inland saline waters.
Objective/Criterion Reference: | Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | One station, Amargosa River below Willow Creek confluence, was sampled.
Temporal Representation: | Two samples were collected on March 18, 2004 and March 16, 2005.
Environmental Conditions: | The Amargosa River flows into California from Nevada and terminates in Death Valley. It is mostly ephemeral but there are perennial reaches. There is great seasonal and annual variability in flows. Most of the watershed is U.S. Bureau of Land Management or National Park land. The Amargosa River is not designated for the Municipal and Domestic Supply (MUN) beneficial use. The MUN use designation was removed in Basin Plan amendments that took effect in 2002. The rationale for removing the use included naturally high salinity and levels of toxic substances such as arsenic, and fluctuating water quantity that would make the river an unreliable supply if treatment were feasible. The perennial reaches of the Amargosa River and the associated riparian areas support a complex of rare, threatened or endangered fish and wildlife species. To Lahontan Water Board staffs knowledge, there are no salmonids in the river and there is no warm water fishery for human consumption.
QAPP Information: | The data meet the quality assurance requirements of the SWAMP QAPP.
QAPP Information Reference(s):

DECISION ID | 24457 | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)

Pollutant: | Oxygen, Dissolved
Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)(2010)
Revision Status | Revised
Impairment from Pollutant or Pollution: | Pollutant
Regional Board Staff Conclusion: | The LOE was incorrectly assigned to the waterbody so there is no data available for this waterbody/pollutant combination. The mapped representation of this waterbody was corrected this cycle. This decision is being decommissioned (to be retired next cycle) while a copy of it as a "Do Not List" now lives with the new mapped representation of this waterbody.
Regional Board Staff Decision Recommendation: | The mapped representation of this waterbody was corrected this cycle. This decision is being decommissioned (to be retired next cycle) while a copy of it as a "Do Not List" now lives with the new mapped representation of this waterbody which is Amargosa River (Willow Creek Confluence to Badwater).

Line of Evidence (LOE) for Decision ID 24457, Oxygen, Dissolved | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)
LOE ID: | 25192
Pollutant: | Oxygen, Dissolved
LOE Subgroup: | Pollutant-Water
Matrix: | Water
Fraction: | Dissolved
Beneficial Use: | Warm Freshwater Habitat
Number of Samples: | 2
Number of Exceedances: | 0
Data and Information Type: | Fixed station physical/chemical (conventional plus toxic pollutants)
Data Used to Assess Water Quality: | The U.S. Geological Survey sampled this station on on March 18, 2004 and March 16, 2005 under the Region 6 SWAMP program. Concentrations of dissolved oxygen in two samples were 9.8 and 7.1 ug/L.
Data Reference: | 2007. SWAMP Data for the Amargosa Hydrologic Unit
SWAMP Data: | SWAMP
Water Quality Objective/Criterion: | The applicable water quality objective (from Lahontan Basin Plan Table 3-6) is a one-day minimum dissolved oxygen concentration of 5 mg/L.
Objective/Criterion Reference: | Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | One station, Amargosa River below Willow Creek, was sampled.
Temporal Representation: | Two samples were collected on March 18, 2004 and March 16, 2005.
Environmental Conditions: | The Amargosa River flows into California from Nevada and terminates in Death Valley. It is mostly ephemeral but there are perennial reaches. There is great seasonal and annual variability in flows. Most of the watershed is U.S. Bureau of Land Management or National Park land. The Amargosa River is not designated for the Municipal and Domestic Supply (MUN) beneficial use. The MUN use designation was removed in Basin Plan amendments that took effect in 2002. The rationale for removing the use included naturally high salinity and levels of toxic substances such as arsenic, and fluctuating water quantity that would make the river an unreliable supply if treatment were feasible. The perennial reaches of the Amargosa River and the associated riparian areas support a complex of rare, threatened or endangered fish and wildlife species. To Lahontan Water Board staffs knowledge, there are no salmonids in the river and there is no warm water fishery for human consumption.
QAPP Information: | The data meet the quality assurance requirements of the SWAMP QAPP.
QAPP Information Reference(s):

DECISION ID | 28325 | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)

Pollutant: | Percent Sodium
Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)(2010)
Revision Status | Revised
Impairment from Pollutant or Pollution: | Pollutant
Regional Board Staff Conclusion: | The LOE was incorrectly assigned to the waterbody so there is no data available for this waterbody/pollutant combination. The mapped representation of this waterbody was corrected this cycle. This decision is being decommissioned (to be retired next cycle) while a copy of it as a "Do Not List" now lives with the new mapped representation of this waterbody.
Regional Board Staff Decision Recommendation: | The mapped representation of this waterbody was corrected this cycle. This decision is being decommissioned (to be retired next cycle) while a copy of it as a "Do Not List" now lives with the new mapped representation of this waterbody which is Amargosa River (Willow Creek Confluence to Badwater).

Line of Evidence (LOE) for Decision ID 28325, Percent Sodium | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)
LOE ID: | 27149
Pollutant: | Percent Sodium
LOE Subgroup: | Pollutant-Water
Matrix: | Water
Fraction: | None
Beneficial Use: | Agricultural Supply
Number of Samples: | 1
Number of Exceedances: | 1
Data and Information Type: | Fixed station physical/chemical (conventional plus toxic pollutants)
Data Used to Assess Water Quality: | The U.S. Geological Survey sampled this station on March 16, 2005 under the Region 6 SWAMP program.. Percent sodium in one sample was 79 percent. Percent sodium is an older and now obsolete criterion for irrigation waters. It is an index for the percentage of sodium ion in the sum of the concentrations of sodium, calcium, magnesium and potassium ions. Waters with percent sodium greater than 70-75 percent were considered to be unsuitable for irrigation use.
Data Reference: | 2007. SWAMP Data for the Amargosa Hydrologic Unit
SWAMP Data: | SWAMP
Water Quality Objective/Criterion: | There is no site-specific water quality objective for Percent Sodium in the Amargosa River. Percent sodium is an older and now obsolete criterion for irrigation waters. It is an index for the percentage of sodium ion in the sum of the concentrations of sodium, calcium, magnesium and potassium ions. Waters with percent sodium greater than 70-75 percent were considered to be unsuitable for irrigation use.
Objective/Criterion Reference: | Water Quality Control Plan for the Lahontan Region (as amended)
| Water Quality Criteria. Second Edition. California State Water Resources Control Board. Publication 3-A
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | One station, Amargosa River below Willow Creek, was sampled.
Temporal Representation: | One sample was collected on March 16, 2005.
Environmental Conditions: | The Amargosa River flows into California from Nevada and terminates in Death Valley. It is mostly ephemeral but there are perennial reaches. There is great seasonal and annual variability in flows. Most of the watershed is U.S. Bureau of Land Management or National Park land. The Amargosa River is not, to Lahontan Water Board staff's knowledge, used for irrigated agriculture. The river's intermittent character and highly variable flows would make it unsuitable for irrigation even if water quality were not naturally poor. The Amargosa River is not designated for the Municipal and Domestic Supply (MUN) beneficial use. The MUN use designation was removed in Basin Plan amendments that took effect in 2002. The rationale for removing the use included naturally high salinity and levels of toxic substances such as arsenic, and fluctuating water quantity that would make the river an unreliable supply if treatment were feasible. The perennial reaches of the Amargosa River and the associated riparian areas support a complex of rare, threatened or endangered fish and wildlife species. To Lahontan Water Board staffs knowledge, there are no salmonids in the river and there is no warm water fishery for human consumption.
QAPP Information: | The data meet the quality assurance requirements of the SWAMP QAPP.
QAPP Information Reference(s):

DECISION ID | 24698 | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)

Pollutant: | Phosphate
Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)(2010)
Revision Status | Revised
Impairment from Pollutant or Pollution: | Pollutant
Regional Board Staff Conclusion: | The LOE was incorrectly assigned to the waterbody so there is no data available for this waterbody/pollutant combination. The mapped representation of this waterbody was corrected this cycle. This decision is being decommissioned (to be retired next cycle) while a copy of it as a "Do Not List" now lives with the new mapped representation of this waterbody.
Regional Board Staff Decision Recommendation: | The mapped representation of this waterbody was corrected this cycle. This decision is being decommissioned (to be retired next cycle) while a copy of it as a "Do Not List" now lives with the new mapped representation of this waterbody which is Amargosa River (Willow Creek Confluence to Badwater).

Line of Evidence (LOE) for Decision ID 24698, Phosphate | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)
LOE ID: | 25217
Pollutant: | Phosphate
LOE Subgroup: | Pollutant-Water
Matrix: | Water
Fraction: | Dissolved
Beneficial Use: | Inland Saline Water Habitat
Number of Samples: | 2
Number of Exceedances: | 0
Data and Information Type: | Fixed station physical/chemical (conventional plus toxic pollutants)
Data Used to Assess Water Quality: | The U.S. Geological Survey sampled this station on on March 18, 2004 and March 16, 2005 under the Region 6 SWAMP program. Two samples had dissolved phosphate concentrations of 0.187 and 0.180 mg/L.
Data Reference: | 2007. SWAMP Data for the Amargosa Hydrologic Unit
SWAMP Data: | SWAMP
Water Quality Objective/Criterion: | There are no applicable state or federal saltwater aquatic life standards or criteria for phosphate in inland saline waters. The Lahontan Basin Plan's regionwide objective for biostimulatory substances states: "Waters shall not contain biostimulatory substances in concentrations that promote aquatic growths to the extent that such growths cause nuisance or adversely affect the water for beneficial uses."
Objective/Criterion Reference: | Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | One station, Amargosa River below Willow Creek, was sampled.
Temporal Representation: | Two samples were collected on March 18, 2004 and March 16, 2005.
Environmental Conditions: | The Amargosa River flows into California from Nevada and terminates in Death Valley. It is mostly ephemeral but there are perennial reaches. There is great seasonal and annual variability in flows. Most of the watershed is U.S. Bureau of Land Management or National Park land. The Amargosa River is not designated for the Municipal and Domestic Supply (MUN) beneficial use. The MUN use designation was removed in Basin Plan amendments that took effect in 2002. The rationale for removing the use included naturally high salinity and levels of toxic substances such as arsenic, and fluctuating water quantity that would make the river an unreliable supply if treatment were feasible. The perennial reaches of the Amargosa River and the associated riparian areas support a complex of rare, threatened or endangered fish and wildlife species. To Lahontan Water Board staffs knowledge, there are no salmonids in the river and there is no warm water fishery for human consumption.
QAPP Information: | The data meet the quality assurance requirements of the SWAMP QAPP.
QAPP Information Reference(s):

DECISION ID | 24585 | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)

Pollutant: | Phosphorus
Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)(2010)
Revision Status | Revised
Impairment from Pollutant or Pollution: | Pollutant
Regional Board Staff Conclusion: | The LOE was incorrectly assigned to the waterbody so there is no data available for this waterbody/pollutant combination. The mapped representation of this waterbody was corrected this cycle. This decision is being decommissioned (to be retired next cycle) while a copy of it as a "Do Not List" now lives with the new mapped representation of this waterbody.
Regional Board Staff Decision Recommendation: | The mapped representation of this waterbody was corrected this cycle. This decision is being decommissioned (to be retired next cycle) while a copy of it as a "Do Not List" now lives with the new mapped representation of this waterbody which is Amargosa River (Willow Creek Confluence to Badwater).

Line of Evidence (LOE) for Decision ID 24585, Phosphorus | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)
LOE ID: | 24893
Pollutant: | Phosphorus
LOE Subgroup: | Pollutant-Sediment
Matrix: | Sediment
Fraction: | None
Beneficial Use: | Inland Saline Water Habitat
Number of Samples: | 1
Number of Exceedances: | 0
Data and Information Type: | Chemical monitoring of sediments
Data Used to Assess Water Quality: | The U.S. Geological Survey sampled sediment at this station on March 16, 2005 under the Region 6 SWAMP program. Results were reported as "bed sediment, smaller than 62.5 um, wet sieved, total digestion." The concentration of phosphorus was 0.063 percent dry weight.
Data Reference: | 2007. SWAMP Data for the Amargosa Hydrologic Unit
SWAMP Data: | SWAMP
Water Quality Objective/Criterion: | There are no state or federal standards or criteria for phosphorus in sediment in inland saline waters.
Objective/Criterion Reference: | Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | One station, Amargosa River below Willow Creek, was sampled.
Temporal Representation: | One sediment sample was collected on March 16, 2005.
Environmental Conditions: | The Amargosa River flows into California from Nevada and terminates in Death Valley. It is mostly ephemeral but there are perennial reaches. There is great seasonal and annual variability in flows. Most of the watershed is U.S. Bureau of Land Management or National Park land. The Amargosa River is not designated for the Municipal and Domestic Supply (MUN) beneficial use. The MUN use designation was removed in Basin Plan amendments that took effect in 2002. The rationale for removing the use included naturally high salinity and levels of toxic substances such as arsenic, and fluctuating water quantity that would make the river an unreliable supply if treatment were feasible. The perennial reaches of the Amargosa River and the associated riparian areas support a complex of rare, threatened or endangered fish and wildlife species. To Lahontan Water Board staffs knowledge, there are no salmonids in the river and there is no warm water fishery for human consumption.
QAPP Information: | Sampling and analysis were done according to the SWAMP QAPP. However, in July 2009 an error was discovered in the QAPP related to holding times for total phosphorus samples that affects the validity of data for the Lahontan Region The holding time for samples that are not acid-preserved.should be 48 hours rather than 28 days as indicated in the QAPP. "Low level" phosphorus analyses, without acid preservation, are used in the Lahontan Region's SWAMP program. .
QAPP Information Reference(s):
Line of Evidence (LOE) for Decision ID 24585, Phosphorus | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)
LOE ID: | 25218
Pollutant: | Phosphorus
LOE Subgroup: | Pollutant-Water
Matrix: | Water
Fraction: | Total
Beneficial Use: | Inland Saline Water Habitat
Number of Samples: | 2
Number of Exceedances: | 0
Data and Information Type: | Fixed station physical/chemical (conventional plus toxic pollutants)
Data Used to Assess Water Quality: | The U.S. Geological Survey sampled this station on on March 18, 2004 and March 16, 2005 under the Region 6 SWAMP program. Two samples had total phosphorus concentrations of 0.258 and 0.236 mg/L.
Data Reference: | 2007. SWAMP Data for the Amargosa Hydrologic Unit
SWAMP Data: | SWAMP
Water Quality Objective/Criterion: | There are no applicable state or federal saltwater aquatic life standards or criteria for total phosphorus in inland saline waters. The Lahontan Basin Plan's regionwide objective for biostimulatory substances states: "Waters shall not contain biostimulatory substances in concentrations that promote aquatic growths to the extent that such growths cause nuisance or adversely affect the water for beneficial uses."
Objective/Criterion Reference: | Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | One station, Amargosa River below Willow Creek, was sampled.
Temporal Representation: | Two samples were collected on March 18, 2004 and March 16, 2005.
Environmental Conditions: | The Amargosa River flows into California from Nevada and terminates in Death Valley. It is mostly ephemeral but there are perennial reaches. There is great seasonal and annual variability in flows. Most of the watershed is U.S. Bureau of Land Management or National Park land. The Amargosa River is not designated for the Municipal and Domestic Supply (MUN) beneficial use. The MUN use designation was removed in Basin Plan amendments that took effect in 2002. The rationale for removing the use included naturally high salinity and levels of toxic substances such as arsenic, and fluctuating water quantity that would make the river an unreliable supply if treatment were feasible. The perennial reaches of the Amargosa River and the associated riparian areas support a complex of rare, threatened or endangered fish and wildlife species. To Lahontan Water Board staffs knowledge, there are no salmonids in the river and there is no warm water fishery for human consumption.
QAPP Information: | Sampling and analysis were done according to the SWAMP QAPP. However, in July 2009 an error was discovered in the QAPP related to holding times for total phosphorus samples that affects the validity of data for the Lahontan Region The holding time for samples that are not acid-preserved.should be 48 hours rather than 28 days as indicated in the QAPP. "Low level" phosphorus analyses, without acid preservation, are used in the Lahontan Region's SWAMP program. .
QAPP Information Reference(s):

DECISION ID | 28438 | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)

Pollutant: | Potassium
Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)(2010)
Revision Status | Revised
Impairment from Pollutant or Pollution: | Pollutant
Regional Board Staff Conclusion: | The LOE was incorrectly assigned to the waterbody so there is no data available for this waterbody/pollutant combination. The mapped representation of this waterbody was corrected this cycle. This decision is being decommissioned (to be retired next cycle) while a copy of it as a "Do Not List" now lives with the new mapped representation of this waterbody.
Regional Board Staff Decision Recommendation: | The mapped representation of this waterbody was corrected this cycle. This decision is being decommissioned (to be retired next cycle) while a copy of it as a "Do Not List" now lives with the new mapped representation of this waterbody which is Amargosa River (Willow Creek Confluence to Badwater).

Line of Evidence (LOE) for Decision ID 28438, Potassium | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)
LOE ID: | 25203
Pollutant: | Potassium
LOE Subgroup: | Pollutant-Water
Matrix: | Water
Fraction: | Dissolved
Beneficial Use: | Inland Saline Water Habitat
Number of Samples: | 2
Number of Exceedances: | 0
Data and Information Type: | Fixed station physical/chemical (conventional plus toxic pollutants)
Data Used to Assess Water Quality: | The U.S. Geological Survey sampled this station on on March 18, 2004 and March 16, 2005 under the Region 6 SWAMP program. Two samples had dissolved potassium concentrations of 42.5 and 43.1 mg/L.
Data Reference: | 2007. SWAMP Data for the Amargosa Hydrologic Unit
SWAMP Data: | SWAMP
Water Quality Objective/Criterion: | There are no applicable state or federal standards or criteria for potassium in inland saline waters.
Objective/Criterion Reference: | Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | One station, Amargosa River below Willow Creek, was sampled.
Temporal Representation: | Two samples were collected on March 18, 2004 and March 16, 2005.
Environmental Conditions: | The Amargosa River flows into California from Nevada and terminates in Death Valley. It is mostly ephemeral but there are perennial reaches. There is great seasonal and annual variability in flows. Most of the watershed is U.S. Bureau of Land Management or National Park land. The Amargosa River is not designated for the Municipal and Domestic Supply (MUN) beneficial use. The MUN use designation was removed in Basin Plan amendments that took effect in 2002. The rationale for removing the use included naturally high salinity and levels of toxic substances such as arsenic, and fluctuating water quantity that would make the river an unreliable supply if treatment were feasible. The perennial reaches of the Amargosa River and the associated riparian areas support a complex of rare, threatened or endangered fish and wildlife species. To Lahontan Water Board staffs knowledge, there are no salmonids in the river and there is no warm water fishery for human consumption.
QAPP Information: | The data meet the quality assurance requirements of the SWAMP QAPP.
QAPP Information Reference(s):
Line of Evidence (LOE) for Decision ID 28438, Potassium | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)
LOE ID: | 24928
Pollutant: | Potassium
LOE Subgroup: | Pollutant-Sediment
Matrix: | Sediment
Fraction: | None
Beneficial Use: | Inland Saline Water Habitat
Number of Samples: | 1
Number of Exceedances: | 0
Data and Information Type: | Chemical monitoring of sediments
Data Used to Assess Water Quality: | The U.S. Geological Survey sampled sediment at this station on March 16, 2005 under the Region 6 SWAMP program. Results were reported as "bed sediment, smaller than 62.5 um, wet sieved, total digestion." The concentration of potassium was 3 percent dry weight.
Data Reference: | 2007. SWAMP Data for the Amargosa Hydrologic Unit
SWAMP Data: | SWAMP
Water Quality Objective/Criterion: | There are no state or federal standards or criteria for potassium in sediment in inland saline waters.
Objective/Criterion Reference: | Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | One station, Amargosa River below Willow Creek, was sampled.
Temporal Representation: | One sediment sample was collected on March 16, 2005.
Environmental Conditions: | The Amargosa River flows into California from Nevada and terminates in Death Valley. It is mostly ephemeral but there are perennial reaches. There is great seasonal and annual variability in flows. Most of the watershed is U.S. Bureau of Land Management or National Park land. The Amargosa River is not designated for the Municipal and Domestic Supply (MUN) beneficial use. The MUN use designation was removed in Basin Plan amendments that took effect in 2002. The rationale for removing the use included naturally high salinity and levels of toxic substances such as arsenic, and fluctuating water quantity that would make the river an unreliable supply if treatment were feasible. The perennial reaches of the Amargosa River and the associated riparian areas support a complex of rare, threatened or endangered fish and wildlife species. To Lahontan Water Board staffs knowledge, there are no salmonids in the river and there is no warm water fishery for human consumption.
QAPP Information: | The data meet the quality assurance requirements of the SWAMP QAPP.
QAPP Information Reference(s):

DECISION ID | 28481 | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)

Pollutant: | Radium 226
Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)(2010)
Revision Status | Revised
Impairment from Pollutant or Pollution: | Pollutant
Regional Board Staff Conclusion: | The LOE was incorrectly assigned to the waterbody so there is no data available for this waterbody/pollutant combination. The mapped representation of this waterbody was corrected this cycle. This decision is being decommissioned (to be retired next cycle) while a copy of it as a "Do Not List" now lives with the new mapped representation of this waterbody.
Regional Board Staff Decision Recommendation: | The mapped representation of this waterbody was corrected this cycle. This decision is being decommissioned (to be retired next cycle) while a copy of it as a "Do Not List" now lives with the new mapped representation of this waterbody which is Amargosa River (Willow Creek Confluence to Badwater).

Line of Evidence (LOE) for Decision ID 28481, Radium 226 | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)
LOE ID: | 27089
Pollutant: | Radium 226
LOE Subgroup: | Pollutant-Water
Matrix: | Water
Fraction: | None
Beneficial Use: | Inland Saline Water Habitat
Number of Samples: | 2
Number of Exceedances: | 0
Data and Information Type: | Fixed station physical/chemical (conventional plus toxic pollutants)
Data Used to Assess Water Quality: | The U.S. Geological Survey sampled this station on on March 18, 2004 and March 16, 2005 under the Region 6 SWAMP program. Two samples had radium 226 levels of 0.09 and 0.051 pCi/L..
Data Reference: | 2007. SWAMP Data for the Amargosa Hydrologic Unit
SWAMP Data: | SWAMP
Water Quality Objective/Criterion: | There are no state or federal saltwater aquatic life standards or criteria specifically for radium 226 in inland saline waters. The Lahontan Basin Plan's narrative objective for radioactivity provdes that: "Radionuclides shall not be present in concentrations which are deleterious to human, plant, animal, or aquatic life nor which result in the accumulation of radionuclides in the food web to an estent which presents a hazard to human, plant, animal or aquatic life." The objective also incorporates California Maximum Contaminant Levels for waters designated for the MUN use. MCLs do not apply to the Amargosa River.
Objective/Criterion Reference: | Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | One station, Amargosa River below Willow Creek, was sampled.
Temporal Representation: | Two samples were collected on March 18, 2004 and March 16, 2005.
Environmental Conditions: | The Amargosa River flows into California from Nevada and terminates in Death Valley. It is mostly ephemeral but there are perennial reaches. There is great seasonal and annual variability in flows. Most of the watershed is U.S. Bureau of Land Management or National Park land. The Amargosa River is not designated for the Municipal and Domestic Supply (MUN) beneficial use. The MUN use designation was removed in Basin Plan amendments that took effect in 2002. The rationale for removing the use included naturally high salinity and levels of toxic substances such as arsenic, and fluctuating water quantity that would make the river an unreliable supply if treatment were feasible. The perennial reaches of the Amargosa River and the associated riparian areas support a complex of rare, threatened or endangered fish and wildlife species. To Lahontan Water Board staffs knowledge, there are no salmonids in the river and there is no warm water fishery for human consumption.
QAPP Information: | The data meet the quality assurance requirements of the SWAMP QAPP.
QAPP Information Reference(s):

DECISION ID | 23954 | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)

Pollutant: | Scandium
Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)(2010)
Revision Status | Revised
Impairment from Pollutant or Pollution: | Pollutant
Regional Board Staff Conclusion: | The LOE was incorrectly assigned to the waterbody so there is no data available for this waterbody/pollutant combination. The mapped representation of this waterbody was corrected this cycle. This decision is being decommissioned (to be retired next cycle) while a copy of it as a "Do Not List" now lives with the new mapped representation of this waterbody.
Regional Board Staff Decision Recommendation: | The mapped representation of this waterbody was corrected this cycle. This decision is being decommissioned (to be retired next cycle) while a copy of it as a "Do Not List" now lives with the new mapped representation of this waterbody which is Amargosa River (Willow Creek Confluence to Badwater).

Line of Evidence (LOE) for Decision ID 23954, Scandium | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)
LOE ID: | 24912
Pollutant: | Scandium
LOE Subgroup: | Pollutant-Sediment
Matrix: | Sediment
Fraction: | None
Beneficial Use: | Inland Saline Water Habitat
Number of Samples: | 1
Number of Exceedances: | 0
Data and Information Type: | Chemical monitoring of sediments
Data Used to Assess Water Quality: | The U.S. Geological Survey sampled sediment at this station on March 16, 2005 under the Region 6 SWAMP program. Results were reported as "bed sediment, smaller than 62.5 um, wet sieved, total digestion." The concentration of scandium was 6 ug/g dry weight.
Data Reference: | 2007. SWAMP Data for the Amargosa Hydrologic Unit
SWAMP Data: | SWAMP
Water Quality Objective/Criterion: | There are no state or federal standards or criteria for scandium in sediment in inland saline waters.
Objective/Criterion Reference: | Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | One station, Amargosa River below Willow Creek, was sampled.
Temporal Representation: | One sediment sample was collected on March 16, 2005.
Environmental Conditions: | The Amargosa River flows into California from Nevada and terminates in Death Valley. It is mostly ephemeral but there are perennial reaches. There is great seasonal and annual variability in flows. Most of the watershed is U.S. Bureau of Land Management or National Park land. The Amargosa River is not designated for the Municipal and Domestic Supply (MUN) beneficial use. The MUN use designation was removed in Basin Plan amendments that took effect in 2002. The rationale for removing the use included naturally high salinity and levels of toxic substances such as arsenic, and fluctuating water quantity that would make the river an unreliable supply if treatment were feasible. The perennial reaches of the Amargosa River and the associated riparian areas support a complex of rare, threatened or endangered fish and wildlife species. To Lahontan Water Board staffs knowledge, there are no salmonids in the river and there is no warm water fishery for human consumption.
QAPP Information: | The data meet the quality assurance requirements of the SWAMP QAPP.
QAPP Information Reference(s):

DECISION ID | 28329 | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)

Pollutant: | Sediment
Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)(2010)
Revision Status | Revised
Impairment from Pollutant or Pollution: | Pollutant
Regional Board Staff Conclusion: | The LOE was incorrectly assigned to the waterbody so there is no data available for this waterbody/pollutant combination. The mapped representation of this waterbody was corrected this cycle. This decision is being decommissioned (to be retired next cycle) while a copy of it as a "Do Not List" now lives with the new mapped representation of this waterbody.
Regional Board Staff Decision Recommendation: | The mapped representation of this waterbody was corrected this cycle. This decision is being decommissioned (to be retired next cycle) while a copy of it as a "Do Not List" now lives with the new mapped representation of this waterbody which is Amargosa River (Willow Creek Confluence to Badwater).

Line of Evidence (LOE) for Decision ID 28329, Sediment | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)
LOE ID: | 27091
Pollutant: | Sediment
LOE Subgroup: | Pollutant-Water
Matrix: | Water
Fraction: | None
Beneficial Use: | Inland Saline Water Habitat
Number of Samples: | 2
Number of Exceedances: | 0
Data and Information Type: | Fixed station physical/chemical (conventional plus toxic pollutants)
Data Used to Assess Water Quality: | The U.S. Geological Survey sampled this station on March 18, 2004 and March 16, 2005 under the Region 6 SWAMP program. Suspended sediment concentrations in two samples were 25 and 46 mg/L. One of the instantaneous flow figures was an estimate and the other was 4.1 cubic feet per second. One of the calculated suspended sediment loads was an estimate and the other was 0.51 tons per day.
Data Reference: | 2007. SWAMP Data for the Amargosa Hydrologic Unit
SWAMP Data: | SWAMP
Water Quality Objective/Criterion: | The Lahontan Basin Plan's narrative objective states: "The suspended sediment load and suspended sediment discharge rate of surface waters shall not be altered in such a manner as to cause nuisance or adversely affect the water for beneficial uses."
Objective/Criterion Reference: | Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | One station, Amargosa River below Willow Creek confluence, was sampled.
Temporal Representation: | Two samples were collected on March 18, 2004 and March 16, 2005.
Environmental Conditions: | The Amargosa River flows into California from Nevada and terminates in Death Valley. It is mostly ephemeral but there are perennial reaches. There is great seasonal and annual variability in flows. Most of the watershed is U.S. Bureau of Land Management or National Park land. The Amargosa River is not designated for the Municipal and Domestic Supply (MUN) beneficial use. The MUN use designation was removed in Basin Plan amendments that took effect in 2002. The rationale for removing the use included naturally high salinity and levels of toxic substances such as arsenic, and fluctuating water quantity that would make the river an unreliable supply if treatment were feasible. The perennial reaches of the Amargosa River and the associated riparian areas support a complex of rare, threatened or endangered fish and wildlife species. To Lahontan Water Board staffs knowledge, there are no salmonids in the river and there is no warm water fishery for human consumption.
QAPP Information: | The data meet the quality assurance requirements of the SWAMP QAPP.
QAPP Information Reference(s):

DECISION ID | 24558 | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)

Pollutant: | Selenium
Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)(2010)
Revision Status | Revised
Impairment from Pollutant or Pollution: | Pollutant
Regional Board Staff Conclusion: | The LOE was incorrectly assigned to the waterbody so there is no data available for this waterbody/pollutant combination. The mapped representation of this waterbody was corrected this cycle. This decision is being decommissioned (to be retired next cycle) while a copy of it as a "Do Not List" now lives with the new mapped representation of this waterbody.
Regional Board Staff Decision Recommendation: | The mapped representation of this waterbody was corrected this cycle. This decision is being decommissioned (to be retired next cycle) while a copy of it as a "Do Not List" now lives with the new mapped representation of this waterbody which is Amargosa River (Willow Creek Confluence to Badwater).

Line of Evidence (LOE) for Decision ID 24558, Selenium | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)
LOE ID: | 24913
Pollutant: | Selenium
LOE Subgroup: | Pollutant-Sediment
Matrix: | Sediment
Fraction: | None
Beneficial Use: | Inland Saline Water Habitat
Number of Samples: | 1
Number of Exceedances: | 0
Data and Information Type: | Chemical monitoring of sediments
Data Used to Assess Water Quality: | The U.S. Geological Survey sampled sediment at this station on March 16, 2005 under the Region 6 SWAMP program. Results were reported as "bed sediment, smaller than 62.5 um, wet sieved, total digestion." The concentration of selenium was below the detection level.
Data Reference: | 2007. SWAMP Data for the Amargosa Hydrologic Unit
SWAMP Data: | SWAMP
Water Quality Objective/Criterion: | There are no state or federal standards or criteria for selenium in sediment in inland saline waters.
Objective/Criterion Reference: | Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | One station, Amargosa River below Willow Creek, was sampled.
Temporal Representation: | One sediment sample was collected on March 16, 2005.
Environmental Conditions: | The Amargosa River flows into California from Nevada and terminates in Death Valley. It is mostly ephemeral but there are perennial reaches. There is great seasonal and annual variability in flows. Most of the watershed is U.S. Bureau of Land Management or National Park land. The Amargosa River is not designated for the Municipal and Domestic Supply (MUN) beneficial use. The MUN use designation was removed in Basin Plan amendments that took effect in 2002. The rationale for removing the use included naturally high salinity and levels of toxic substances such as arsenic, and fluctuating water quantity that would make the river an unreliable supply if treatment were feasible. The perennial reaches of the Amargosa River and the associated riparian areas support a complex of rare, threatened or endangered fish and wildlife species. To Lahontan Water Board staffs knowledge, there are no salmonids in the river and there is no warm water fishery for human consumption.
QAPP Information: | The data meet the quality assurance requirements of the SWAMP QAPP.
QAPP Information Reference(s):
Line of Evidence (LOE) for Decision ID 24558, Selenium | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)
LOE ID: | 25089
Pollutant: | Selenium
LOE Subgroup: | Pollutant-Water
Matrix: | Water
Fraction: | Dissolved
Beneficial Use: | Inland Saline Water Habitat
Number of Samples: | 2
Number of Exceedances: | 0
Data and Information Type: | Fixed station physical/chemical (conventional plus toxic pollutants)
Data Used to Assess Water Quality: | The U.S. Geological Survey sampled this station on on March 18, 2004 and March 16, 2005 under the Region 6 SWAMP program. Two samples had dissolved selenium concentrations of 0.8 and 1.4 ug/L.
Data Reference: | 2007. SWAMP Data for the Amargosa Hydrologic Unit
SWAMP Data: | SWAMP
Water Quality Objective/Criterion: | The California Toxics Rule's saltwater aquatic life standards for dissolved selenium include an acute toxicity limit of 290 ug/L and a chronic toxicity limit of 71 ug/L.
Objective/Criterion Reference: | Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | One station, Amargosa River below Willow Creek, was sampled.
Temporal Representation: | Two samples were collected on March 18, 2004 and March 16, 2005.
Environmental Conditions: | The Amargosa River flows into California from Nevada and terminates in Death Valley. It is mostly ephemeral but there are perennial reaches. There is great seasonal and annual variability in flows. Most of the watershed is U.S. Bureau of Land Management or National Park land. The Amargosa River is not designated for the Municipal and Domestic Supply (MUN) beneficial use. The MUN use designation was removed in Basin Plan amendments that took effect in 2002. The rationale for removing the use included naturally high salinity and levels of toxic substances such as arsenic, and fluctuating water quantity that would make the river an unreliable supply if treatment were feasible. The perennial reaches of the Amargosa River and the associated riparian areas support a complex of rare, threatened or endangered fish and wildlife species. To Lahontan Water Board staffs knowledge, there are no salmonids in the river and there is no warm water fishery for human consumption.
QAPP Information: | The data meet the quality assurance requirements of the SWAMP QAPP.
QAPP Information Reference(s):
Line of Evidence (LOE) for Decision ID 24558, Selenium | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)
LOE ID: | 25088
Pollutant: | Selenium
LOE Subgroup: | Pollutant-Water
Matrix: | Water
Fraction: | Total
Beneficial Use: | Inland Saline Water Habitat
Number of Samples: | 2
Number of Exceedances: | 0
Data and Information Type: | Fixed station physical/chemical (conventional plus toxic pollutants)
Data Used to Assess Water Quality: | The U.S. Geological Survey sampled this station on on March 18, 2004 and March 16, 2005 under the Region 6 SWAMP program. One of 2 samples for total selenium was below the detection level and the other had a concentration of 1.9 ug/L.
Data Reference: | 2007. SWAMP Data for the Amargosa Hydrologic Unit
SWAMP Data: | SWAMP
Water Quality Objective/Criterion: | There are no applicable state or federal saltwater aquatic life standards or criteria for total selenium in inland saline waters.
Objective/Criterion Reference: | Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | One station, Amargosa River below Willow Creek, was sampled.
Temporal Representation: | Two samples were collected on March 18, 2004 and March 16, 2005.
Environmental Conditions: | The Amargosa River flows into California from Nevada and terminates in Death Valley. It is mostly ephemeral but there are perennial reaches. There is great seasonal and annual variability in flows. Most of the watershed is U.S. Bureau of Land Management or National Park land. The Amargosa River is not designated for the Municipal and Domestic Supply (MUN) beneficial use. The MUN use designation was removed in Basin Plan amendments that took effect in 2002. The rationale for removing the use included naturally high salinity and levels of toxic substances such as arsenic, and fluctuating water quantity that would make the river an unreliable supply if treatment were feasible. The perennial reaches of the Amargosa River and the associated riparian areas support a complex of rare, threatened or endangered fish and wildlife species. To Lahontan Water Board staffs knowledge, there are no salmonids in the river and there is no warm water fishery for human consumption.
QAPP Information: | The data meet the quality assurance requirements of the SWAMP QAPP.
QAPP Information Reference(s):

DECISION ID | 24602 | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)

Pollutant: | Silica
Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)(2010)
Revision Status | Revised
Impairment from Pollutant or Pollution: | Pollutant
Regional Board Staff Conclusion: | The LOE was incorrectly assigned to the waterbody so there is no data available for this waterbody/pollutant combination. The mapped representation of this waterbody was corrected this cycle. This decision is being decommissioned (to be retired next cycle) while a copy of it as a "Do Not List" now lives with the new mapped representation of this waterbody.
Regional Board Staff Decision Recommendation: | After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because there are no applicable water quality standards or criteria and the minimum sample number requirements of the Listing Policy are not met.

Line of Evidence (LOE) for Decision ID 24602, Silica | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)
LOE ID: | 25209
Pollutant: | Silica
LOE Subgroup: | Pollutant-Water
Matrix: | Water
Fraction: | Dissolved
Beneficial Use: | Inland Saline Water Habitat
Number of Samples: | 2
Number of Exceedances: | 0
Data and Information Type: | Fixed station physical/chemical (conventional plus toxic pollutants)
Data Used to Assess Water Quality: | The U.S. Geological Survey sampled this station on on March 18, 2004 and March 16, 2005 under the Region 6 SWAMP program. Two samples had dissolved silica concentrations of 52.7 and 54.6 mg/L.
Data Reference: | 2007. SWAMP Data for the Amargosa Hydrologic Unit
SWAMP Data: | SWAMP
Water Quality Objective/Criterion: | There are no applicable state or federal saltwater aquatic life standards or criteria for silica in inland saline waters.
Objective/Criterion Reference: | Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | One station, Amargosa River below Willow Creek, was sampled.
Temporal Representation: | Two samples were collected on March 18, 2004 and March 16, 2005.
Environmental Conditions: | The Amargosa River flows into California from Nevada and terminates in Death Valley. It is mostly ephemeral but there are perennial reaches. There is great seasonal and annual variability in flows. Most of the watershed is U.S. Bureau of Land Management or National Park land. The Amargosa River is not designated for the Municipal and Domestic Supply (MUN) beneficial use. The MUN use designation was removed in Basin Plan amendments that took effect in 2002. The rationale for removing the use included naturally high salinity and levels of toxic substances such as arsenic, and fluctuating water quantity that would make the river an unreliable supply if treatment were feasible. The perennial reaches of the Amargosa River and the associated riparian areas support a complex of rare, threatened or endangered fish and wildlife species. To Lahontan Water Board staffs knowledge, there are no salmonids in the river and there is no warm water fishery for human consumption.
QAPP Information: | The data meet the quality assurance requirements of the SWAMP QAPP.
QAPP Information Reference(s):

DECISION ID | 24391 | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)

Pollutant: | Silver
Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)(2010)
Revision Status | Revised
Impairment from Pollutant or Pollution: | Pollutant
Regional Board Staff Conclusion: | The LOE was incorrectly assigned to the waterbody so there is no data available for this waterbody/pollutant combination. The mapped representation of this waterbody was corrected this cycle. This decision is being decommissioned (to be retired next cycle) while a copy of it as a "Do Not List" now lives with the new mapped representation of this waterbody.
Regional Board Staff Decision Recommendation: | The mapped representation of this waterbody was corrected this cycle. This decision is being decommissioned (to be retired next cycle) while a copy of it as a "Do Not List" now lives with the new mapped representation of this waterbody which is Amargosa River (Willow Creek Confluence to Badwater).

Line of Evidence (LOE) for Decision ID 24391, Silver | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)
LOE ID: | 25091
Pollutant: | Silver
LOE Subgroup: | Pollutant-Water
Matrix: | Water
Fraction: | Total
Beneficial Use: | Inland Saline Water Habitat
Number of Samples: | 2
Number of Exceedances: | 0
Data and Information Type: | Fixed station physical/chemical (conventional plus toxic pollutants)
Data Used to Assess Water Quality: | The U.S. Geological Survey sampled this station on on March 18, 2004 and March 16, 2005 under the Region 6 SWAMP program. Concentrations of total silver in two samples were both below the detection level.
Data Reference: | 2007. SWAMP Data for the Amargosa Hydrologic Unit
SWAMP Data: | SWAMP
Water Quality Objective/Criterion: | There are no applicable state or federal saltwater aquatic life standards or criteria for total silver in inland saline waters.
Objective/Criterion Reference: | Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | One station, Amargosa River below Willow Creek, was sampled.
Temporal Representation: | Two samples were collected on March 18, 2004 and March 16, 2005.
Environmental Conditions: | The Amargosa River flows into California from Nevada and terminates in Death Valley. It is mostly ephemeral but there are perennial reaches. There is great seasonal and annual variability in flows. Most of the watershed is U.S. Bureau of Land Management or National Park land. The Amargosa River is not designated for the Municipal and Domestic Supply (MUN) beneficial use. The MUN use designation was removed in Basin Plan amendments that took effect in 2002. The rationale for removing the use included naturally high salinity and levels of toxic substances such as arsenic, and fluctuating water quantity that would make the river an unreliable supply if treatment were feasible. The perennial reaches of the Amargosa River and the associated riparian areas support a complex of rare, threatened or endangered fish and wildlife species. To Lahontan Water Board staffs knowledge, there are no salmonids in the river and there is no warm water fishery for human consumption.
QAPP Information: | The data meet the quality assurance requirements of the SWAMP QAPP.
QAPP Information Reference(s):
Line of Evidence (LOE) for Decision ID 24391, Silver | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)
LOE ID: | 25090
Pollutant: | Silver
LOE Subgroup: | Pollutant-Water
Matrix: | Water
Fraction: | Dissolved
Beneficial Use: | Inland Saline Water Habitat
Number of Samples: | 2
Number of Exceedances: | 0
Data and Information Type: | Fixed station physical/chemical (conventional plus toxic pollutants)
Data Used to Assess Water Quality: | The U.S. Geological Survey sampled this station on on March 18, 2004 and March 16, 2005 under the Region 6 SWAMP program. Concentrations of dissolved silver in two samples were both below the detection level.
Data Reference: | 2007. SWAMP Data for the Amargosa Hydrologic Unit
SWAMP Data: | SWAMP
Water Quality Objective/Criterion: | The California Toxics Rule's saltwater aquatic life standard for silver is an acute toxicity limit of 1.9 ug/L.
Objective/Criterion Reference: | Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | One station, Amargosa River below Willow Creek, was sampled.
Temporal Representation: | Two samples were collected on March 18, 2004 and March 16, 2005.
Environmental Conditions: | The Amargosa River flows into California from Nevada and terminates in Death Valley. It is mostly ephemeral but there are perennial reaches. There is great seasonal and annual variability in flows. Most of the watershed is U.S. Bureau of Land Management or National Park land. The Amargosa River is not designated for the Municipal and Domestic Supply (MUN) beneficial use. The MUN use designation was removed in Basin Plan amendments that took effect in 2002. The rationale for removing the use included naturally high salinity and levels of toxic substances such as arsenic, and fluctuating water quantity that would make the river an unreliable supply if treatment were feasible. The perennial reaches of the Amargosa River and the associated riparian areas support a complex of rare, threatened or endangered fish and wildlife species. To Lahontan Water Board staffs knowledge, there are no salmonids in the river and there is no warm water fishery for human consumption.
QAPP Information: | The data meet the quality assurance requirements of the SWAMP QAPP.
QAPP Information Reference(s):
Line of Evidence (LOE) for Decision ID 24391, Silver | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)
LOE ID: | 24937
Pollutant: | Silver
LOE Subgroup: | Pollutant-Sediment
Matrix: | Sediment
Fraction: | None
Beneficial Use: | Inland Saline Water Habitat
Number of Samples: | 1
Number of Exceedances: | 0
Data and Information Type: | Chemical monitoring of sediments
Data Used to Assess Water Quality: | The U.S. Geological Survey sampled sediment at this station on March 16, 2005 under the Region 6 SWAMP program. Results were reported as "bed sediment, smaller than 62.5 um, wet sieved, total digestion." The concentration of lead was 0.2 ug/g dry weight.
Data Reference: | 2007. SWAMP Data for the Amargosa Hydrologic Unit
SWAMP Data: | SWAMP
Water Quality Objective/Criterion: | There are no state or federal standards or criteria for silver in sediment in inland saline waters. The Probable Effects Level for silver in marine and estuarine sediments is 1.77 ug/g dry weight; see MacDonald et al. (1996).
Objective/Criterion Reference: | Development and evaluation of sediment quality guidelines for Florida coastal waters. Ecotoxicology 5: 253-278
| Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | One station, Amargosa River below Willow Creek, was sampled.
Temporal Representation: | One sediment sample was collected on March 16, 2005.
Environmental Conditions: | The Amargosa River flows into California from Nevada and terminates in Death Valley. It is mostly ephemeral but there are perennial reaches. There is great seasonal and annual variability in flows. Most of the watershed is U.S. Bureau of Land Management or National Park land. The Amargosa River is not designated for the Municipal and Domestic Supply (MUN) beneficial use. The MUN use designation was removed in Basin Plan amendments that took effect in 2002. The rationale for removing the use included naturally high salinity and levels of toxic substances such as arsenic, and fluctuating water quantity that would make the river an unreliable supply if treatment were feasible. The perennial reaches of the Amargosa River and the associated riparian areas support a complex of rare, threatened or endangered fish and wildlife species. To Lahontan Water Board staffs knowledge, there are no salmonids in the river and there is no warm water fishery for human consumption.
QAPP Information: | The data meet the quality assurance requirements of the SWAMP QAPP.
QAPP Information Reference(s):

DECISION ID | 28439 | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)

Pollutant: | Sodium
Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)(2010)
Revision Status | Revised
Impairment from Pollutant or Pollution: | Pollutant
Regional Board Staff Conclusion: | The LOE was incorrectly assigned to the waterbody so there is no data available for this waterbody/pollutant combination. The mapped representation of this waterbody was corrected this cycle. This decision is being decommissioned (to be retired next cycle) while a copy of it as a "Do Not List" now lives with the new mapped representation of this waterbody.
Regional Board Staff Decision Recommendation: | The mapped representation of this waterbody was corrected this cycle. This decision is being decommissioned (to be retired next cycle) while a copy of it as a "Do Not List" now lives with the new mapped representation of this waterbody which is Amargosa River (Willow Creek Confluence to Badwater).

Line of Evidence (LOE) for Decision ID 28439, Sodium | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)
LOE ID: | 25204
Pollutant: | Sodium
LOE Subgroup: | Pollutant-Water
Matrix: | Water
Fraction: | Dissolved
Beneficial Use: | Inland Saline Water Habitat
Number of Samples: | 2
Number of Exceedances: | 0
Data and Information Type: | Fixed station physical/chemical (conventional plus toxic pollutants)
Data Used to Assess Water Quality: | The U.S. Geological Survey sampled this station on on March 18, 2004 and March 16, 2005 under the Region 6 SWAMP program. Two samples had dissolved sodium concentrations of 851 and 759 mg/L.
Data Reference: | 2007. SWAMP Data for the Amargosa Hydrologic Unit
SWAMP Data: | SWAMP
Water Quality Objective/Criterion: | There are no applicable state or federal saltwater aquatic life standards or criteria for sodium in inland saline waters.
Objective/Criterion Reference: | Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | One station, Amargosa River below Willow Creek, was sampled.
Temporal Representation: | Two samples were collected on March 18, 2004 and March 16, 2005.
Environmental Conditions: | The Amargosa River flows into California from Nevada and terminates in Death Valley. It is mostly ephemeral but there are perennial reaches. There is great seasonal and annual variability in flows. Most of the watershed is U.S. Bureau of Land Management or National Park land. The Amargosa River is not designated for the Municipal and Domestic Supply (MUN) beneficial use. The MUN use designation was removed in Basin Plan amendments that took effect in 2002. The rationale for removing the use included naturally high salinity and levels of toxic substances such as arsenic, and fluctuating water quantity that would make the river an unreliable supply if treatment were feasible. The perennial reaches of the Amargosa River and the associated riparian areas support a complex of rare, threatened or endangered fish and wildlife species. To Lahontan Water Board staffs knowledge, there are no salmonids in the river and there is no warm water fishery for human consumption.
QAPP Information: | The data meet the quality assurance requirements of the SWAMP QAPP.
QAPP Information Reference(s):
Line of Evidence (LOE) for Decision ID 28439, Sodium | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)
LOE ID: | 24927
Pollutant: | Sodium
LOE Subgroup: | Pollutant-Sediment
Matrix: | Sediment
Fraction: | None
Beneficial Use: | Inland Saline Water Habitat
Number of Samples: | 1
Number of Exceedances: | 0
Data and Information Type: | Chemical monitoring of sediments
Data Used to Assess Water Quality: | The U.S. Geological Survey sampled sediment at this station on March 16, 2005 under the Region 6 SWAMP program. Results were reported as "bed sediment, smaller than 62.5 um, wet sieved, total digestion." The concentration of sodium was 2 percent dry weight.
Data Reference: | 2007. SWAMP Data for the Amargosa Hydrologic Unit
SWAMP Data: | SWAMP
Water Quality Objective/Criterion: | There are no state or federal standards or criteria for sodium in sediment in inland saline waters.
Objective/Criterion Reference: | Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | One station, Amargosa River below Willow Creek, was sampled.
Temporal Representation: | One sediment sample was collected on March 16, 2005.
Environmental Conditions: | The Amargosa River flows into California from Nevada and terminates in Death Valley. It is mostly ephemeral but there are perennial reaches. There is great seasonal and annual variability in flows. Most of the watershed is U.S. Bureau of Land Management or National Park land. The Amargosa River is not designated for the Municipal and Domestic Supply (MUN) beneficial use. The MUN use designation was removed in Basin Plan amendments that took effect in 2002. The rationale for removing the use included naturally high salinity and levels of toxic substances such as arsenic, and fluctuating water quantity that would make the river an unreliable supply if treatment were feasible. The perennial reaches of the Amargosa River and the associated riparian areas support a complex of rare, threatened or endangered fish and wildlife species. To Lahontan Water Board staffs knowledge, there are no salmonids in the river and there is no warm water fishery for human consumption.
QAPP Information: | The data meet the quality assurance requirements of the SWAMP QAPP.
QAPP Information Reference(s):

DECISION ID | 28326 | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)

Pollutant: | Sodium Adsorption Ratio (SAR)
Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)(2010)
Revision Status | Revised
Impairment from Pollutant or Pollution: | Pollutant
Regional Board Staff Conclusion: | The LOE was incorrectly assigned to the waterbody so there is no data available for this waterbody/pollutant combination. The mapped representation of this waterbody was corrected this cycle. This decision is being decommissioned (to be retired next cycle) while a copy of it as a "Do Not List" now lives with the new mapped representation of this waterbody.
Regional Board Staff Decision Recommendation: | The mapped representation of this waterbody was corrected this cycle. This decision is being decommissioned (to be retired next cycle) while a copy of it as a "Do Not List" now lives with the new mapped representation of this waterbody which is Amargosa River (Willow Creek Confluence to Badwater).

Line of Evidence (LOE) for Decision ID 28326, Sodium Adsorption Ratio (SAR) | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)
LOE ID: | 27147
Pollutant: | Sodium Adsorption Ratio (SAR)
LOE Subgroup: | Pollutant-Water
Matrix: | Water
Fraction: | Dissolved
Beneficial Use: | Agricultural Supply
Number of Samples: | 1
Number of Exceedances: | 1
Data and Information Type: | Fixed station physical/chemical (conventional plus toxic pollutants)
Data Used to Assess Water Quality: | The U.S. Geological Survey sampled this station on March 16, 2005 under the Region 6 SWAMP program. One sample had an SAR value of 17.
Data Reference: | 2007. SWAMP Data for the Amargosa Hydrologic Unit
SWAMP Data: | SWAMP
Water Quality Objective/Criterion: | Sodium Adsorption Ratio (SAR) is a criterion for irrigation waters that has replaced Percent Sodium. It quantifies the relative proportions of sodium, calcium, and magnesium ions. SAR values greater than 9 can impose severe restrictions on the use of irrigation water due to sodium toxicity to crops.
Objective/Criterion Reference: | Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | One station, Amargosa River below Willow Creek, was sampled.
Temporal Representation: | One sample was collected on March 16, 2005.
Environmental Conditions: | The Amargosa River flows into California from Nevada and terminates in Death Valley. It is mostly ephemeral but there are perennial reaches. There is great seasonal and annual variability in flows. Most of the watershed is U.S. Bureau of Land Management or National Park land. The Amargosa River is not, to Lahontan Water Board staff's knowledge, use for irrigated agriculture. Its intermittent nature and highly variable flows would make it unsuitable for irrigation even if water quality were not naturally poor. The Amargosa River is not designated for the Municipal and Domestic Supply (MUN) beneficial use. The MUN use designation was removed in Basin Plan amendments that took effect in 2002. The rationale for removing the use included naturally high salinity and levels of toxic substances such as arsenic, and fluctuating water quantity that would make the river an unreliable supply if treatment were feasible. The perennial reaches of the Amargosa River and the associated riparian areas support a complex of rare, threatened or endangered fish and wildlife species. To Lahontan Water Board staffs knowledge, there are no salmonids in the river and there is no warm water fishery for human consumption.
QAPP Information: | The data meet the quality assurance requirements of the SWAMP QAPP.
QAPP Information Reference(s):

DECISION ID | 22517 | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)

Pollutant: | Specific Conductance
Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)(2010)
Revision Status | Revised
Impairment from Pollutant or Pollution: | Pollutant
Regional Board Staff Conclusion: | The LOE was incorrectly assigned to the waterbody so there is no data available for this waterbody/pollutant combination. The mapped representation of this waterbody was corrected this cycle. This decision is being decommissioned (to be retired next cycle) while a copy of it as a "Do Not List" now lives with the new mapped representation of this waterbody.
Regional Board Staff Decision Recommendation: | The mapped representation of this waterbody was corrected this cycle. This decision is being decommissioned (to be retired next cycle) while a copy of it as a "Do Not List" now lives with the new mapped representation of this waterbody which is Amargosa River (Willow Creek Confluence to Badwater).

Line of Evidence (LOE) for Decision ID 22517, Specific Conductance | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)
LOE ID: | 27047
Pollutant: | Specific Conductance
LOE Subgroup: | Pollutant-Water
Matrix: | Water
Fraction: | None
Beneficial Use: | Inland Saline Water Habitat
Number of Samples: | 2
Number of Exceedances: | 0
Data and Information Type: | Fixed station physical/chemical (conventional plus toxic pollutants)
Data Used to Assess Water Quality: | The U.S. Geological Survey sampled this station on on March 18, 2004 and March 16, 2005 under the Region 6 SWAMP program. Two specific conductance measurements were 4000 and 3680 uS/cm, reflecting the saline character of the river..
Data Reference: | 2007. SWAMP Data for the Amargosa Hydrologic Unit
SWAMP Data: | SWAMP
Water Quality Objective/Criterion: | There are no applicable state or federal saltwater aquatic life standards or criteria for specific conductance in inland saline waters.
Objective/Criterion Reference: | Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | One station, Amargosa River below Willow Creek, was sampled.
Temporal Representation: | Two specific conductance measurements were taken on March 18, 2004 and March 16, 2005.
Environmental Conditions: | The Amargosa River flows into California from Nevada and terminates in Death Valley. It is mostly ephemeral but there are perennial reaches. There is great seasonal and annual variability in flows. Most of the watershed is U.S. Bureau of Land Management or National Park land. The Amargosa River is not designated for the Municipal and Domestic Supply (MUN) beneficial use. The MUN use designation was removed in Basin Plan amendments that took effect in 2002. The rationale for removing the use included naturally high salinity and levels of toxic substances such as arsenic, and fluctuating water quantity that would make the river an unreliable supply if treatment were feasible. The perennial reaches of the Amargosa River and the associated riparian areas support a complex of rare, threatened or endangered fish and wildlife species. To Lahontan Water Board staffs knowledge, there are no salmonids in the river and there is no warm water fishery for human consumption.
QAPP Information: | The data meet the quality assurance requirements of the SWAMP QAPP.
QAPP Information Reference(s):

DECISION ID | 25243 | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)

Pollutant: | Strontium
Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)(2010)
Revision Status | Revised
Impairment from Pollutant or Pollution: | Pollutant
Regional Board Staff Conclusion: | The LOE was incorrectly assigned to the waterbody so there is no data available for this waterbody/pollutant combination. The mapped representation of this waterbody was corrected this cycle. This decision is being decommissioned (to be retired next cycle) while a copy of it as a "Do Not List" now lives with the new mapped representation of this waterbody.
Regional Board Staff Decision Recommendation: | The mapped representation of this waterbody was corrected this cycle. This decision is being decommissioned (to be retired next cycle) while a copy of it as a "Do Not List" now lives with the new mapped representation of this waterbody which is Amargosa River (Willow Creek Confluence to Badwater).

Line of Evidence (LOE) for Decision ID 25243, Strontium | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)
LOE ID: | 24914
Pollutant: | Strontium
LOE Subgroup: | Pollutant-Sediment
Matrix: | Sediment
Fraction: | None
Beneficial Use: | Inland Saline Water Habitat
Number of Samples: | 1
Number of Exceedances: | 0
Data and Information Type: | Chemical monitoring of sediments
Data Used to Assess Water Quality: | The U.S. Geological Survey sampled sediment at this station on March 16, 2005 under the Region 6 SWAMP program. Results were reported as "bed sediment, smaller than 62.5 um, wet sieved, total digestion." The concentration of strontium was 560 ug/g dry weight.
Data Reference: | 2007. SWAMP Data for the Amargosa Hydrologic Unit
SWAMP Data: | SWAMP
Water Quality Objective/Criterion: | There are no state or federal standards or criteria for strontium in sediment in inland saline waters.
Objective/Criterion Reference: | Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | One station, Amargosa River below Willow Creek, was sampled.
Temporal Representation: | One sediment sample was collected on March 16, 2005.
Environmental Conditions: | The Amargosa River flows into California from Nevada and terminates in Death Valley. It is mostly ephemeral but there are perennial reaches. There is great seasonal and annual variability in flows. Most of the watershed is U.S. Bureau of Land Management or National Park land. The Amargosa River is not designated for the Municipal and Domestic Supply (MUN) beneficial use. The MUN use designation was removed in Basin Plan amendments that took effect in 2002. The rationale for removing the use included naturally high salinity and levels of toxic substances such as arsenic, and fluctuating water quantity that would make the river an unreliable supply if treatment were feasible. The perennial reaches of the Amargosa River and the associated riparian areas support a complex of rare, threatened or endangered fish and wildlife species. To Lahontan Water Board staffs knowledge, there are no salmonids in the river and there is no warm water fishery for human consumption.
QAPP Information: | The data meet the quality assurance requirements of the SWAMP QAPP.
QAPP Information Reference(s):

DECISION ID | 23779 | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)

Pollutant: | Sulfates
Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)(2010)
Revision Status | Revised
Impairment from Pollutant or Pollution: | Pollutant
Regional Board Staff Conclusion: | The LOE was incorrectly assigned to the waterbody so there is no data available for this waterbody/pollutant combination. The mapped representation of this waterbody was corrected this cycle. This decision is being decommissioned (to be retired next cycle) while a copy of it as a "Do Not List" now lives with the new mapped representation of this waterbody.
Regional Board Staff Decision Recommendation: | The mapped representation of this waterbody was corrected this cycle. This decision is being decommissioned (to be retired next cycle) while a copy of it as a "Do Not List" now lives with the new mapped representation of this waterbody which is Amargosa River (Willow Creek Confluence to Badwater).

Line of Evidence (LOE) for Decision ID 23779, Sulfates | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)
LOE ID: | 25210
Pollutant: | Sulfates
LOE Subgroup: | Pollutant-Water
Matrix: | Water
Fraction: | Dissolved
Beneficial Use: | Inland Saline Water Habitat
Number of Samples: | 2
Number of Exceedances: | 0
Data and Information Type: | Fixed station physical/chemical (conventional plus toxic pollutants)
Data Used to Assess Water Quality: | The U.S. Geological Survey sampled this station on on March 18, 2004 and March 16, 2005 under the Region 6 SWAMP program. Two samples had dissolved sulfate concentrations of 796 and 844 mg/L.
Data Reference: | 2007. SWAMP Data for the Amargosa Hydrologic Unit
SWAMP Data: | SWAMP
Water Quality Objective/Criterion: | There are no applicable state or federal saltwater aquatic life standards or criteria for sulfate in inland saline waters.
Objective/Criterion Reference: | Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | One station, Amargosa River below Willow Creek, was sampled.
Temporal Representation: | Two samples were collected on March 18, 2004 and March 16, 2005.
Environmental Conditions: | The Amargosa River flows into California from Nevada and terminates in Death Valley. It is mostly ephemeral but there are perennial reaches. There is great seasonal and annual variability in flows. Most of the watershed is U.S. Bureau of Land Management or National Park land. The Amargosa River is not designated for the Municipal and Domestic Supply (MUN) beneficial use. The MUN use designation was removed in Basin Plan amendments that took effect in 2002. The rationale for removing the use included naturally high salinity and levels of toxic substances such as arsenic, and fluctuating water quantity that would make the river an unreliable supply if treatment were feasible. The perennial reaches of the Amargosa River and the associated riparian areas support a complex of rare, threatened or endangered fish and wildlife species. To Lahontan Water Board staffs knowledge, there are no salmonids in the river and there is no warm water fishery for human consumption.
QAPP Information: | The data meet the quality assurance requirements of the SWAMP QAPP.
QAPP Information Reference(s):

DECISION ID | 24359 | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)

Pollutant: | Sulfur
Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)(2010)
Revision Status | Revised
Impairment from Pollutant or Pollution: | Pollutant
Regional Board Staff Conclusion: | The LOE was incorrectly assigned to the waterbody so there is no data available for this waterbody/pollutant combination. The mapped representation of this waterbody was corrected this cycle. This decision is being decommissioned (to be retired next cycle) while a copy of it as a "Do Not List" now lives with the new mapped representation of this waterbody.
Regional Board Staff Decision Recommendation: | The mapped representation of this waterbody was corrected this cycle. This decision is being decommissioned (to be retired next cycle) while a copy of it as a "Do Not List" now lives with the new mapped representation of this waterbody which is Amargosa River (Willow Creek Confluence to Badwater).

Line of Evidence (LOE) for Decision ID 24359, Sulfur | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)
LOE ID: | 25188
Pollutant: | Sulfur
LOE Subgroup: | Pollutant-Sediment
Matrix: | Sediment
Fraction: | None
Beneficial Use: | Inland Saline Water Habitat
Number of Samples: | 1
Number of Exceedances: | 0
Data and Information Type: | Chemical monitoring of sediments
Data Used to Assess Water Quality: | The U.S. Geological Survey sampled sediment at this station on March 16, 2005 under the Region 6 SWAMP program. Results were reported as "bed sediment, smaller than 62.5 um, wet sieved, total digestion." The concentration of sulfur was less than 0.05 percent dry weight.
Data Reference: | 2007. SWAMP Data for the Amargosa Hydrologic Unit
SWAMP Data: | SWAMP
Water Quality Objective/Criterion: | There are no state or federal standards or criteria for sulfur in sediment in inland saline waters.
Objective/Criterion Reference: | Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | One station, Amargosa River below Willow Creek, was sampled.
Temporal Representation: | One sediment sample was collected on March 16, 2005.
Environmental Conditions: | The Amargosa River flows into California from Nevada and terminates in Death Valley. It is mostly ephemeral but there are perennial reaches. There is great seasonal and annual variability in flows. Most of the watershed is U.S. Bureau of Land Management or National Park land. The Amargosa River is not designated for the Municipal and Domestic Supply (MUN) beneficial use. The MUN use designation was removed in Basin Plan amendments that took effect in 2002. The rationale for removing the use included naturally high salinity and levels of toxic substances such as arsenic, and fluctuating water quantity that would make the river an unreliable supply if treatment were feasible. The perennial reaches of the Amargosa River and the associated riparian areas support a complex of rare, threatened or endangered fish and wildlife species. To Lahontan Water Board staffs knowledge, there are no salmonids in the river and there is no warm water fishery for human consumption.
QAPP Information: | The data meet the quality assurance requirements of the SWAMP QAPP.
QAPP Information Reference(s):

DECISION ID | 25186 | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)

Pollutant: | Tantalum
Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)(2010)
Revision Status | Revised
Impairment from Pollutant or Pollution: | Pollutant
Regional Board Staff Conclusion: | The LOE was incorrectly assigned to the waterbody so there is no data available for this waterbody/pollutant combination. The mapped representation of this waterbody was corrected this cycle. This decision is being decommissioned (to be retired next cycle) while a copy of it as a "Do Not List" now lives with the new mapped representation of this waterbody.
Regional Board Staff Decision Recommendation: | The mapped representation of this waterbody was corrected this cycle. This decision is being decommissioned (to be retired next cycle) while a copy of it as a "Do Not List" now lives with the new mapped representation of this waterbody which is Amargosa River (Willow Creek Confluence to Badwater).

Line of Evidence (LOE) for Decision ID 25186, Tantalum | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)
LOE ID: | 24915
Pollutant: | Tantalum
LOE Subgroup: | Pollutant-Sediment
Matrix: | Sediment
Fraction: | None
Beneficial Use: | Inland Saline Water Habitat
Number of Samples: | 1
Number of Exceedances: | 0
Data and Information Type: | Chemical monitoring of sediments
Data Used to Assess Water Quality: | The U.S. Geological Survey sampled sediment at this station on March 16, 2005 under the Region 6 SWAMP program. Results were reported as "bed sediment, smaller than 62.5 um, wet sieved, total digestion." The concentration of tantalum was below the detection levelt.
Data Reference: | 2007. SWAMP Data for the Amargosa Hydrologic Unit
SWAMP Data: | SWAMP
Water Quality Objective/Criterion: | There are no state or federal standards or criteria for tantalum in sediment in inland saline waters.
Objective/Criterion Reference: | Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | One station, Amargosa River below Willow Creek, was sampled.
Temporal Representation: | One sediment sample was collected on March 16, 2005.
Environmental Conditions: | The Amargosa River flows into California from Nevada and terminates in Death Valley. It is mostly ephemeral but there are perennial reaches. There is great seasonal and annual variability in flows. Most of the watershed is U.S. Bureau of Land Management or National Park land. The Amargosa River is not designated for the Municipal and Domestic Supply (MUN) beneficial use. The MUN use designation was removed in Basin Plan amendments that took effect in 2002. The rationale for removing the use included naturally high salinity and levels of toxic substances such as arsenic, and fluctuating water quantity that would make the river an unreliable supply if treatment were feasible. The perennial reaches of the Amargosa River and the associated riparian areas support a complex of rare, threatened or endangered fish and wildlife species. To Lahontan Water Board staffs knowledge, there are no salmonids in the river and there is no warm water fishery for human consumption.
QAPP Information: | The data meet the quality assurance requirements of the SWAMP QAPP.
QAPP Information Reference(s):

DECISION ID | 25280 | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)

Pollutant: | Temperature, water
Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)(2010)
Revision Status | Revised
Impairment from Pollutant or Pollution: | Pollutant
Regional Board Staff Conclusion: | The LOE was incorrectly assigned to the waterbody so there is no data available for this waterbody/pollutant combination. The mapped representation of this waterbody was corrected this cycle. This decision is being decommissioned (to be retired next cycle) while a copy of it as a "Do Not List" now lives with the new mapped representation of this waterbody.
Regional Board Staff Decision Recommendation: | The mapped representation of this waterbody was corrected this cycle. This decision is being decommissioned (to be retired next cycle) while a copy of it as a "Do Not List" now lives with the new mapped representation of this waterbody which is Amargosa River (Willow Creek Confluence to Badwater).

Line of Evidence (LOE) for Decision ID 25280, Temperature, water | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)
LOE ID: | 25195
Pollutant: | Temperature, water
LOE Subgroup: | Pollutant-Water
Matrix: | Water
Fraction: | None
Beneficial Use: | Warm Freshwater Habitat
Number of Samples: | 2
Number of Exceedances: | 0
Data and Information Type: | Fixed station physical/chemical (conventional plus toxic pollutants)
Data Used to Assess Water Quality: | The U.S. Geological Survey sampled this station on on March 18, 2004 and March 16, 2005 under the Region 6 SWAMP program. Two samples had temperatures of 17 and 16 degrees Celsius.
Data Reference: | 2007. SWAMP Data for the Amargosa Hydrologic Unit
SWAMP Data: | SWAMP
Water Quality Objective/Criterion: | The temperature objective in the Lahontan Basin Plan states: "The natural receiving water temperature of all waters shall not be altered unless it can be demonstrated to the satisfaction of the Regional Board that such an alteration in temperature does not adversely affect the water for beneficial uses. For waters designated WARM, water temperature shall not be altered by more than five degrees Fahrenheit ... above or below the natural temperature. For waters designated COLD, the temperature shall not be altered. Temperature objectives for COLD interstate waters and WARM interstate waters are as specified in the 'Water Quality Control Plan for Control of Temperature in The Coastal and Interstate Waters and Enclosed Bays and Estuaries of California' including any revisions."
Objective/Criterion Reference: | Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | One station, Amargosa River below Willow Creek, was sampled.
Temporal Representation: | Two temperature measurements were taken on March 18, 2004 and March 16, 2005.
Environmental Conditions: | The Amargosa River flows into California from Nevada and terminates in Death Valley. It is mostly ephemeral but there are perennial reaches. There is great seasonal and annual variability in flows. Most of the watershed is U.S. Bureau of Land Management or National Park land. The Amargosa River is not designated for the Municipal and Domestic Supply (MUN) beneficial use. The MUN use designation was removed in Basin Plan amendments that took effect in 2002. The rationale for removing the use included naturally high salinity and levels of toxic substances such as arsenic, and fluctuating water quantity that would make the river an unreliable supply if treatment were feasible. The perennial reaches of the Amargosa River and the associated riparian areas support a complex of rare, threatened or endangered fish and wildlife species. To Lahontan Water Board staffs knowledge, there are no salmonids in the river and there is no warm water fishery for human consumption.
QAPP Information: | The data meet the quality assurance requirements of the SWAMP QAPP.
QAPP Information Reference(s):

DECISION ID | 24547 | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)

Pollutant: | Thallium
Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)(2010)
Revision Status | Revised
Impairment from Pollutant or Pollution: | Pollutant
Regional Board Staff Conclusion: | The LOE was incorrectly assigned to the waterbody so there is no data available for this waterbody/pollutant combination. The mapped representation of this waterbody was corrected this cycle. This decision is being decommissioned (to be retired next cycle) while a copy of it as a "Do Not List" now lives with the new mapped representation of this waterbody.
Regional Board Staff Decision Recommendation: | The mapped representation of this waterbody was corrected this cycle. This decision is being decommissioned (to be retired next cycle) while a copy of it as a "Do Not List" now lives with the new mapped representation of this waterbody which is Amargosa River (Willow Creek Confluence to Badwater).

Line of Evidence (LOE) for Decision ID 24547, Thallium | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)
LOE ID: | 25094
Pollutant: | Thallium
LOE Subgroup: | Pollutant-Water
Matrix: | Water
Fraction: | Dissolved
Beneficial Use: | Inland Saline Water Habitat
Number of Samples: | 2
Number of Exceedances: | 0
Data and Information Type: | Fixed station physical/chemical (conventional plus toxic pollutants)
Data Used to Assess Water Quality: | The U.S. Geological Survey sampled this station on on March 18, 2004 and March 16, 2005 under the Region 6 SWAMP program. The concentration of dissolved thallium in one of two samples was below the detection level, and the other sample was an estimated value.
Data Reference: | 2007. SWAMP Data for the Amargosa Hydrologic Unit
SWAMP Data: | SWAMP
Water Quality Objective/Criterion: | There are no applicable state or federal saltwater aquatic life standards or criteria for dissolved thallium in inland saline waters.
Objective/Criterion Reference: | Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | One station, Amargosa River below Willow Creek, was sampled.
Temporal Representation: | Two samples were collected on March 18, 2004 and March 16, 2005.
Environmental Conditions: | The Amargosa River flows into California from Nevada and terminates in Death Valley. It is mostly ephemeral but there are perennial reaches. There is great seasonal and annual variability in flows. Most of the watershed is U.S. Bureau of Land Management or National Park land. The Amargosa River is not designated for the Municipal and Domestic Supply (MUN) beneficial use. The MUN use designation was removed in Basin Plan amendments that took effect in 2002. The rationale for removing the use included naturally high salinity and levels of toxic substances such as arsenic, and fluctuating water quantity that would make the river an unreliable supply if treatment were feasible. The perennial reaches of the Amargosa River and the associated riparian areas support a complex of rare, threatened or endangered fish and wildlife species. To Lahontan Water Board staffs knowledge, there are no salmonids in the river and there is no warm water fishery for human consumption.
QAPP Information: | The data meet the quality assurance requirements of the SWAMP QAPP.
QAPP Information Reference(s):
Line of Evidence (LOE) for Decision ID 24547, Thallium | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)
LOE ID: | 25092
Pollutant: | Thallium
LOE Subgroup: | Pollutant-Water
Matrix: | Water
Fraction: | Total
Beneficial Use: | Inland Saline Water Habitat
Number of Samples: | 2
Number of Exceedances: | 0
Data and Information Type: | Fixed station physical/chemical (conventional plus toxic pollutants)
Data Used to Assess Water Quality: | The U.S. Geological Survey sampled this station on on March 18, 2004 and March 16, 2005 under the Region 6 SWAMP program. Concentrations of total thallium in two samples were both below the detection level.
Data Reference: | 2007. SWAMP Data for the Amargosa Hydrologic Unit
SWAMP Data: | SWAMP
Water Quality Objective/Criterion: | There are no applicable state or federal saltwater aquatic life standards or criteria for total thallium in inland saline waters.
Objective/Criterion Reference: | Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | One station, Amargosa River below Willow Creek, was sampled.
Temporal Representation: | Two samples were collected on March 18, 2004 and March 16, 2005.
Environmental Conditions: | The Amargosa River flows into California from Nevada and terminates in Death Valley. It is mostly ephemeral but there are perennial reaches. There is great seasonal and annual variability in flows. Most of the watershed is U.S. Bureau of Land Management or National Park land. The Amargosa River is not designated for the Municipal and Domestic Supply (MUN) beneficial use. The MUN use designation was removed in Basin Plan amendments that took effect in 2002. The rationale for removing the use included naturally high salinity and levels of toxic substances such as arsenic, and fluctuating water quantity that would make the river an unreliable supply if treatment were feasible. The perennial reaches of the Amargosa River and the associated riparian areas support a complex of rare, threatened or endangered fish and wildlife species. To Lahontan Water Board staffs knowledge, there are no salmonids in the river and there is no warm water fishery for human consumption.
QAPP Information: | The data meet the quality assurance requirements of the SWAMP QAPP.
QAPP Information Reference(s):
Line of Evidence (LOE) for Decision ID 24547, Thallium | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)
LOE ID: | 24916
Pollutant: | Thallium
LOE Subgroup: | Pollutant-Sediment
Matrix: | Sediment
Fraction: | None
Beneficial Use: | Inland Saline Water Habitat
Number of Samples: | 1
Number of Exceedances: | 0
Data and Information Type: | Chemical monitoring of sediments
Data Used to Assess Water Quality: | The U.S. Geological Survey sampled sediment at this station on March 16, 2005 under the Region 6 SWAMP program. Results were reported as "bed sediment, smaller than 62.5 um, wet sieved, total digestion." The concentration of thallium was below the detection levelt.
Data Reference: | 2007. SWAMP Data for the Amargosa Hydrologic Unit
SWAMP Data: | SWAMP
Water Quality Objective/Criterion: | There are no state or federal standards or criteria for thallium in sediment in inland saline waters.
Objective/Criterion Reference: | Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | One station, Amargosa River below Willow Creek, was sampled.
Temporal Representation: | One sediment sample was collected on March 16, 2005.
Environmental Conditions: | The Amargosa River flows into California from Nevada and terminates in Death Valley. It is mostly ephemeral but there are perennial reaches. There is great seasonal and annual variability in flows. Most of the watershed is U.S. Bureau of Land Management or National Park land. The Amargosa River is not designated for the Municipal and Domestic Supply (MUN) beneficial use. The MUN use designation was removed in Basin Plan amendments that took effect in 2002. The rationale for removing the use included naturally high salinity and levels of toxic substances such as arsenic, and fluctuating water quantity that would make the river an unreliable supply if treatment were feasible. The perennial reaches of the Amargosa River and the associated riparian areas support a complex of rare, threatened or endangered fish and wildlife species. To Lahontan Water Board staffs knowledge, there are no salmonids in the river and there is no warm water fishery for human consumption.
QAPP Information: | The data meet the quality assurance requirements of the SWAMP QAPP.
QAPP Information Reference(s):

DECISION ID | 23955 | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)

Pollutant: | Thorium
Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)(2010)
Revision Status | Revised
Impairment from Pollutant or Pollution: | Pollutant
Regional Board Staff Conclusion: | The LOE was incorrectly assigned to the waterbody so there is no data available for this waterbody/pollutant combination. The mapped representation of this waterbody was corrected this cycle. This decision is being decommissioned (to be retired next cycle) while a copy of it as a "Do Not List" now lives with the new mapped representation of this waterbody.
Regional Board Staff Decision Recommendation: | The mapped representation of this waterbody was corrected this cycle. This decision is being decommissioned (to be retired next cycle) while a copy of it as a "Do Not List" now lives with the new mapped representation of this waterbody which is Amargosa River (Willow Creek Confluence to Badwater).

Line of Evidence (LOE) for Decision ID 23955, Thorium | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)
LOE ID: | 24917
Pollutant: | Thorium
LOE Subgroup: | Pollutant-Sediment
Matrix: | Sediment
Fraction: | None
Beneficial Use: | Inland Saline Water Habitat
Number of Samples: | 1
Number of Exceedances: | 0
Data and Information Type: | Chemical monitoring of sediments
Data Used to Assess Water Quality: | The U.S. Geological Survey sampled sediment at this station on March 16, 2005 under the Region 6 SWAMP program. Results were reported as "bed sediment, smaller than 62.5 um, wet sieved, total digestion." The concentration of thorium was 10 ug/g dry weight.
Data Reference: | 2007. SWAMP Data for the Amargosa Hydrologic Unit
SWAMP Data: | SWAMP
Water Quality Objective/Criterion: | There are no state or federal standards or criteria for thorium in sediment in inland saline waters.
Objective/Criterion Reference: | Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | One station, Amargosa River below Willow Creek, was sampled.
Temporal Representation: | One sediment sample was collected on March 16, 2005.
Environmental Conditions: | The Amargosa River flows into California from Nevada and terminates in Death Valley. It is mostly ephemeral but there are perennial reaches. There is great seasonal and annual variability in flows. Most of the watershed is U.S. Bureau of Land Management or National Park land. The Amargosa River is not designated for the Municipal and Domestic Supply (MUN) beneficial use. The MUN use designation was removed in Basin Plan amendments that took effect in 2002. The rationale for removing the use included naturally high salinity and levels of toxic substances such as arsenic, and fluctuating water quantity that would make the river an unreliable supply if treatment were feasible. The perennial reaches of the Amargosa River and the associated riparian areas support a complex of rare, threatened or endangered fish and wildlife species. To Lahontan Water Board staffs knowledge, there are no salmonids in the river and there is no warm water fishery for human consumption.
QAPP Information: | The data meet the quality assurance requirements of the SWAMP QAPP.
QAPP Information Reference(s):

DECISION ID | 23956 | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)

Pollutant: | Tin
Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)(2010)
Revision Status | Revised
Impairment from Pollutant or Pollution: | Pollutant
Regional Board Staff Conclusion: | The LOE was incorrectly assigned to the waterbody so there is no data available for this waterbody/pollutant combination. The mapped representation of this waterbody was corrected this cycle. This decision is being decommissioned (to be retired next cycle) while a copy of it as a "Do Not List" now lives with the new mapped representation of this waterbody.
Regional Board Staff Decision Recommendation: | The mapped representation of this waterbody was corrected this cycle. This decision is being decommissioned (to be retired next cycle) while a copy of it as a "Do Not List" now lives with the new mapped representation of this waterbody which is Amargosa River (Willow Creek Confluence to Badwater).

Line of Evidence (LOE) for Decision ID 23956, Tin | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)
LOE ID: | 24918
Pollutant: | Tin
LOE Subgroup: | Pollutant-Sediment
Matrix: | Sediment
Fraction: | None
Beneficial Use: | Inland Saline Water Habitat
Number of Samples: | 1
Number of Exceedances: | 0
Data and Information Type: | Chemical monitoring of sediments
Data Used to Assess Water Quality: | The U.S. Geological Survey sampled sediment at this station on March 16, 2005 under the Region 6 SWAMP program. Results were reported as "bed sediment, smaller than 62.5 um, wet sieved, total digestion." The concentration of tin was 2 ug/g dry weight.
Data Reference: | 2007. SWAMP Data for the Amargosa Hydrologic Unit
SWAMP Data: | SWAMP
Water Quality Objective/Criterion: | There are no state or federal standards or criteria for tin in sediment in inland saline waters.
Objective/Criterion Reference: | Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | One station, Amargosa River below Willow Creek, was sampled.
Temporal Representation: | One sediment sample was collected on March 16, 2005.
Environmental Conditions: | The Amargosa River flows into California from Nevada and terminates in Death Valley. It is mostly ephemeral but there are perennial reaches. There is great seasonal and annual variability in flows. Most of the watershed is U.S. Bureau of Land Management or National Park land. The Amargosa River is not designated for the Municipal and Domestic Supply (MUN) beneficial use. The MUN use designation was removed in Basin Plan amendments that took effect in 2002. The rationale for removing the use included naturally high salinity and levels of toxic substances such as arsenic, and fluctuating water quantity that would make the river an unreliable supply if treatment were feasible. The perennial reaches of the Amargosa River and the associated riparian areas support a complex of rare, threatened or endangered fish and wildlife species. To Lahontan Water Board staffs knowledge, there are no salmonids in the river and there is no warm water fishery for human consumption.
QAPP Information: | The data meet the quality assurance requirements of the SWAMP QAPP.
QAPP Information Reference(s):

DECISION ID | 24212 | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)

Pollutant: | Titanium
Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)(2010)
Revision Status | Revised
Impairment from Pollutant or Pollution: | Pollutant
Regional Board Staff Conclusion: | The LOE was incorrectly assigned to the waterbody so there is no data available for this waterbody/pollutant combination. The mapped representation of this waterbody was corrected this cycle. This decision is being decommissioned (to be retired next cycle) while a copy of it as a "Do Not List" now lives with the new mapped representation of this waterbody.
Regional Board Staff Decision Recommendation: | The mapped representation of this waterbody was corrected this cycle. This decision is being decommissioned (to be retired next cycle) while a copy of it as a "Do Not List" now lives with the new mapped representation of this waterbody which is Amargosa River (Willow Creek Confluence to Badwater).

Line of Evidence (LOE) for Decision ID 24212, Titanium | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)
LOE ID: | 24919
Pollutant: | Titanium
LOE Subgroup: | Pollutant-Sediment
Matrix: | Sediment
Fraction: | None
Beneficial Use: | Inland Saline Water Habitat
Number of Samples: | 1
Number of Exceedances: | 0
Data and Information Type: | Chemical monitoring of sediments
Data Used to Assess Water Quality: | The U.S. Geological Survey sampled sediment at this station on March 16, 2005 under the Region 6 SWAMP program. Results were reported as "bed sediment, smaller than 62.5 um, wet sieved, total digestion." The concentration of titanium was 0.24 percent dry weight.
Data Reference: | 2007. SWAMP Data for the Amargosa Hydrologic Unit
SWAMP Data: | SWAMP
Water Quality Objective/Criterion: | There are no state or federal standards or criteria for titanium in sediment in inland saline waters.
Objective/Criterion Reference: | Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | One station, Amargosa River below Willow Creek, was sampled.
Temporal Representation: | One sediment sample was collected on March 16, 2005.
Environmental Conditions: | The Amargosa River flows into California from Nevada and terminates in Death Valley. It is mostly ephemeral but there are perennial reaches. There is great seasonal and annual variability in flows. Most of the watershed is U.S. Bureau of Land Management or National Park land. The Amargosa River is not designated for the Municipal and Domestic Supply (MUN) beneficial use. The MUN use designation was removed in Basin Plan amendments that took effect in 2002. The rationale for removing the use included naturally high salinity and levels of toxic substances such as arsenic, and fluctuating water quantity that would make the river an unreliable supply if treatment were feasible. The perennial reaches of the Amargosa River and the associated riparian areas support a complex of rare, threatened or endangered fish and wildlife species. To Lahontan Water Board staffs knowledge, there are no salmonids in the river and there is no warm water fishery for human consumption.
QAPP Information: | The data meet the quality assurance requirements of the SWAMP QAPP.
QAPP Information Reference(s):

DECISION ID | 23791 | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)

Pollutant: | Total Dissolved Solids
Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)(2010)
Revision Status | Revised
Impairment from Pollutant or Pollution: | Pollutant
Regional Board Staff Conclusion: | The LOE was incorrectly assigned to the waterbody so there is no data available for this waterbody/pollutant combination. The mapped representation of this waterbody was corrected this cycle. This decision is being decommissioned (to be retired next cycle) while a copy of it as a "Do Not List" now lives with the new mapped representation of this waterbody.
Regional Board Staff Decision Recommendation: | The mapped representation of this waterbody was corrected this cycle. This decision is being decommissioned (to be retired next cycle) while a copy of it as a "Do Not List" now lives with the new mapped representation of this waterbody which is Amargosa River (Willow Creek Confluence to Badwater).

Line of Evidence (LOE) for Decision ID 23791, Total Dissolved Solids | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)
LOE ID: | 25211
Pollutant: | Total Dissolved Solids
LOE Subgroup: | Pollutant-Water
Matrix: | Water
Fraction: | Total Dissolved
Beneficial Use: | Inland Saline Water Habitat
Number of Samples: | 2
Number of Exceedances: | 0
Data and Information Type: | Fixed station physical/chemical (conventional plus toxic pollutants)
Data Used to Assess Water Quality: | The U.S. Geological Survey sampled this station on on March 18, 2004 and March 16, 2005 under the Region 6 SWAMP program. Two samples had TDS concentrations of 2840 and 2550 mg/L. A third sample was reported as "residue", with a concentration of 2550 mg/L.
Data Reference: | 2007. SWAMP Data for the Amargosa Hydrologic Unit
SWAMP Data: | SWAMP
Water Quality Objective/Criterion: | There are no applicable state or federal saltwater aquatic life standards or criteria for total dissolved solids (TDS) in inland saline waters.
Objective/Criterion Reference: | Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | One station, Amargosa River below Willow Creek, was sampled.
Temporal Representation: | Two samples were collected on March 18, 2004 and March 16, 2005.
Environmental Conditions: | The Amargosa River flows into California from Nevada and terminates in Death Valley. It is mostly ephemeral but there are perennial reaches. There is great seasonal and annual variability in flows. Most of the watershed is U.S. Bureau of Land Management or National Park land. The Amargosa River is not designated for the Municipal and Domestic Supply (MUN) beneficial use. The MUN use designation was removed in Basin Plan amendments that took effect in 2002. The rationale for removing the use included naturally high salinity and levels of toxic substances such as arsenic, and fluctuating water quantity that would make the river an unreliable supply if treatment were feasible. The perennial reaches of the Amargosa River and the associated riparian areas support a complex of rare, threatened or endangered fish and wildlife species. To Lahontan Water Board staffs knowledge, there are no salmonids in the river and there is no warm water fishery for human consumption.
QAPP Information: | The data meet the quality assurance requirements of the SWAMP QAPP.
QAPP Information Reference(s):

DECISION ID | 28500 | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)

Pollutant: | Triclopyr
Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)(2010)
Revision Status | Revised
Impairment from Pollutant or Pollution: | Pollutant
Regional Board Staff Conclusion: | The LOE was incorrectly assigned to the waterbody so there is no data available for this waterbody/pollutant combination. The mapped representation of this waterbody was corrected this cycle. This decision is being decommissioned (to be retired next cycle) while a copy of it as a "Do Not List" now lives with the new mapped representation of this waterbody.
Regional Board Staff Decision Recommendation: | The mapped representation of this waterbody was corrected this cycle. This decision is being decommissioned (to be retired next cycle) while a copy of it as a "Do Not List" now lives with the new mapped representation of this waterbody which is Amargosa River (Willow Creek Confluence to Badwater).

Line of Evidence (LOE) for Decision ID 28500, Triclopyr | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)
LOE ID: | 27050
Pollutant: | Triclopyr
LOE Subgroup: | Pollutant-Water
Matrix: | Water
Fraction: | None
Beneficial Use: | Inland Saline Water Habitat
Number of Samples: | 1
Number of Exceedances: | 1
Data and Information Type: | Fixed station physical/chemical (conventional plus toxic pollutants)
Data Used to Assess Water Quality: | The U.S. Geological Survey sampled this station on March 17, 2004 under the Region 6 SWAMP program. The single sample had a detectable triclopyr concentration of 0.06 ug/L.
Data Reference: | 2007. SWAMP Data for the Amargosa Hydrologic Unit
SWAMP Data: | SWAMP
Water Quality Objective/Criterion: | There are no state or federal saltwater aquatic life standards or criteria for the herbicide triclopyr in inland saline waters. The Lahontan Basin Plan's narrative objective for pesticides provides that: "Pesticide concentrations, individually or collectively, shall not exceed the lowest detectable levels, using the most recent detection procedures available."
Objective/Criterion Reference: | Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | One station, Amargosa River below Willow Creek confluence, was sampled.
Temporal Representation: | One sample was collected on March 18, 2004.
Environmental Conditions: | The Amargosa River flows into California from Nevada and terminates in Death Valley. It is mostly ephemeral but there are perennial reaches. There is great seasonal and annual variability in flows. Most of the watershed is U.S. Bureau of Land Management or National Park land. The Amargosa River is not designated for the Municipal and Domestic Supply (MUN) beneficial use. The MUN use designation was removed in Basin Plan amendments that took effect in 2002. The rationale for removing the use included naturally high salinity and levels of toxic substances such as arsenic, and fluctuating water quantity that would make the river an unreliable supply if treatment were feasible. The perennial reaches of the Amargosa River and the associated riparian areas support a complex of rare, threatened or endangered fish and wildlife species. To Lahontan Water Board staffs knowledge, there are no salmonids in the river and there is no warm water fishery for human consumption.
QAPP Information: | The data meet the quality assurance requirements of the SWAMP QAPP.
QAPP Information Reference(s):

DECISION ID | 28482 | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)

Pollutant: | Tritium
Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)(2010)
Revision Status | Revised
Impairment from Pollutant or Pollution: | Pollutant
Regional Board Staff Conclusion: | The LOE was incorrectly assigned to the waterbody so there is no data available for this waterbody/pollutant combination. The mapped representation of this waterbody was corrected this cycle. This decision is being decommissioned (to be retired next cycle) while a copy of it as a "Do Not List" now lives with the new mapped representation of this waterbody.
Regional Board Staff Decision Recommendation: | The mapped representation of this waterbody was corrected this cycle. This decision is being decommissioned (to be retired next cycle) while a copy of it as a "Do Not List" now lives with the new mapped representation of this waterbody which is Amargosa River (Willow Creek Confluence to Badwater).

Line of Evidence (LOE) for Decision ID 28482, Tritium | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)
LOE ID: | 27090
Pollutant: | Tritium
LOE Subgroup: | Pollutant-Water
Matrix: | Water
Fraction: | None
Beneficial Use: | Inland Saline Water Habitat
Number of Samples: | 2
Number of Exceedances: | 0
Data and Information Type: | Fixed station physical/chemical (conventional plus toxic pollutants)
Data Used to Assess Water Quality: | The U.S. Geological Survey sampled this station on on March 18, 2004 and March 16, 2005 under the Region 6 SWAMP program. Two samples had tritium counts of 1.6 and 1.7 pCi/L. The tritium 2 sigma combined uncertainties were 0.58 and 0.64 pCi/L.
Data Reference: | 2007. SWAMP Data for the Amargosa Hydrologic Unit
SWAMP Data: | SWAMP
Water Quality Objective/Criterion: | There are no state or federal saltwater aquatic life standards or criteria specifically for tritium in inland saline waters. The Lahontan Basin Plan's narrative objective for radioactivity provdes that: "Radionuclides shall not be present in concentrations which are deleterious to human, plant, animal, or aquatic life nor which result in the accumulation of radionuclides in the food web to an estent which presents a hazard to human, plant, animal or aquatic life." The objective also incorporates California Maximum Contaminant Levels for waters designated for the MUN use. MCLs do not apply to the Amargosa River.
Objective/Criterion Reference: | Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | One station, Amargosa River below Willow Creek, was sampled.
Temporal Representation: | Two samples were collected on March 18, 2004 and March 16, 2005.
Environmental Conditions: | The Amargosa River flows into California from Nevada and terminates in Death Valley. It is mostly ephemeral but there are perennial reaches. There is great seasonal and annual variability in flows. Most of the watershed is U.S. Bureau of Land Management or National Park land. The Amargosa River is not designated for the Municipal and Domestic Supply (MUN) beneficial use. The MUN use designation was removed in Basin Plan amendments that took effect in 2002. The rationale for removing the use included naturally high salinity and levels of toxic substances such as arsenic, and fluctuating water quantity that would make the river an unreliable supply if treatment were feasible. The perennial reaches of the Amargosa River and the associated riparian areas support a complex of rare, threatened or endangered fish and wildlife species. To Lahontan Water Board staffs knowledge, there are no salmonids in the river and there is no warm water fishery for human consumption.
QAPP Information: | The data meet the quality assurance requirements of the SWAMP QAPP.
QAPP Information Reference(s):

DECISION ID | 28483 | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)

Pollutant: | Turbidity
Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)(2010)
Revision Status | Revised
Impairment from Pollutant or Pollution: | Pollutant
Regional Board Staff Conclusion: | The LOE was incorrectly assigned to the waterbody so there is no data available for this waterbody/pollutant combination. The mapped representation of this waterbody was corrected this cycle. This decision is being decommissioned (to be retired next cycle) while a copy of it as a "Do Not List" now lives with the new mapped representation of this waterbody.
Regional Board Staff Decision Recommendation: | The mapped representation of this waterbody was corrected this cycle. This decision is being decommissioned (to be retired next cycle) while a copy of it as a "Do Not List" now lives with the new mapped representation of this waterbody which is Amargosa River (Willow Creek Confluence to Badwater).

Line of Evidence (LOE) for Decision ID 28483, Turbidity | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)
LOE ID: | 27145
Pollutant: | Turbidity
LOE Subgroup: | Pollutant-Water
Matrix: | Water
Fraction: | Dissolved
Beneficial Use: | Inland Saline Water Habitat
Number of Samples: | 1
Number of Exceedances: | 0
Data and Information Type: | Fixed station physical/chemical (conventional plus toxic pollutants)
Data Used to Assess Water Quality: | The U.S. Geological Survey sampled this station on on March 18, 2004 Turbidity was 14 NTU.
Data Reference: | 2007. SWAMP Data for the Amargosa Hydrologic Unit
SWAMP Data: | SWAMP
Water Quality Objective/Criterion: | The Lahontan Basin Plan's regionwide turbidity objective states: "Waters shall be free of changes in turbidity that cause nuisance or adversely affect the water for beneficial uses. Increases in turbidity shall not exceed natural levels by more than 10 percent."
Objective/Criterion Reference: | Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | One station, Amargosa River below Willow Creek, was sampled.
Temporal Representation: | One turbidity measurement was taken on March 18, 2004.
Environmental Conditions: | The Amargosa River flows into California from Nevada and terminates in Death Valley. It is mostly ephemeral but there are perennial reaches. There is great seasonal and annual variability in flows. Most of the watershed is U.S. Bureau of Land Management or National Park land. The Amargosa River is not designated for the Municipal and Domestic Supply (MUN) beneficial use. The MUN use designation was removed in Basin Plan amendments that took effect in 2002. The rationale for removing the use included naturally high salinity and levels of toxic substances such as arsenic, and fluctuating water quantity that would make the river an unreliable supply if treatment were feasible. The perennial reaches of the Amargosa River and the associated riparian areas support a complex of rare, threatened or endangered fish and wildlife species. To Lahontan Water Board staffs knowledge, there are no salmonids in the river and there is no warm water fishery for human consumption.
QAPP Information: | The data meet the quality assurance requirements of the SWAMP QAPP.
QAPP Information Reference(s):
Line of Evidence (LOE) for Decision ID 28483, Turbidity | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)
LOE ID: | 27158
Pollutant: | Turbidity
LOE Subgroup: | Pollutant-Water
Matrix: | Water
Fraction: | Dissolved
Beneficial Use: | Inland Saline Water Habitat
Number of Samples: | 1
Number of Exceedances: | 0
Data and Information Type: | Fixed station physical/chemical (conventional plus toxic pollutants)
Data Used to Assess Water Quality: | The U.S. Geological Survey sampled this station on on March16, 2005 Turbidity was 9.7 NTRU.
Data Reference: | 2007. SWAMP Data for the Amargosa Hydrologic Unit
SWAMP Data: | SWAMP
Water Quality Objective/Criterion: | The Lahontan Basin Plan's regionwide turbidity objective states: "Waters shall be free of changes in turbidity that cause nuisance or adversely affect the water for beneficial uses. Increases in turbidity shall not exceed natural levels by more than 10 percent."
Objective/Criterion Reference: | Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | One station, Amargosa River below Willow Creek, was sampled.
Temporal Representation: | One turbidity measurement was taken on March 16, 2005.
Environmental Conditions: | The Amargosa River flows into California from Nevada and terminates in Death Valley. It is mostly ephemeral but there are perennial reaches. There is great seasonal and annual variability in flows. Most of the watershed is U.S. Bureau of Land Management or National Park land. The Amargosa River is not designated for the Municipal and Domestic Supply (MUN) beneficial use. The MUN use designation was removed in Basin Plan amendments that took effect in 2002. The rationale for removing the use included naturally high salinity and levels of toxic substances such as arsenic, and fluctuating water quantity that would make the river an unreliable supply if treatment were feasible. The perennial reaches of the Amargosa River and the associated riparian areas support a complex of rare, threatened or endangered fish and wildlife species. To Lahontan Water Board staffs knowledge, there are no salmonids in the river and there is no warm water fishery for human consumption.
QAPP Information: | The data meet the quality assurance requirements of the SWAMP QAPP.
QAPP Information Reference(s):

DECISION ID | 28285 | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)

Pollutant: | Uranium
Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)(2010)
Revision Status | Revised
Impairment from Pollutant or Pollution: | Pollutant
Regional Board Staff Conclusion: | The LOE was incorrectly assigned to the waterbody so there is no data available for this waterbody/pollutant combination. The mapped representation of this waterbody was corrected this cycle. This decision is being decommissioned (to be retired next cycle) while a copy of it as a "Do Not List" now lives with the new mapped representation of this waterbody.
Regional Board Staff Decision Recommendation: | The mapped representation of this waterbody was corrected this cycle. This decision is being decommissioned (to be retired next cycle) while a copy of it as a "Do Not List" now lives with the new mapped representation of this waterbody which is Amargosa River (Willow Creek Confluence to Badwater).

Line of Evidence (LOE) for Decision ID 28285, Uranium | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)
LOE ID: | 24924
Pollutant: | Uranium
LOE Subgroup: | Pollutant-Sediment
Matrix: | Sediment
Fraction: | None
Beneficial Use: | Inland Saline Water Habitat
Number of Samples: | 1
Number of Exceedances: | 0
Data and Information Type: | Chemical monitoring of sediments
Data Used to Assess Water Quality: | The U.S. Geological Survey sampled sediment at this station on March 16, 2005under the Region 6 SWAMP program. Results were reported as "bed sediment, smaller than 62.5 um, wet sieved, total digestion." The concentration of uranium was 2.7 ug/g dry weight.
Data Reference: | 2007. SWAMP Data for the Amargosa Hydrologic Unit
SWAMP Data: | SWAMP
Water Quality Objective/Criterion: | There are no state or federal standards or criteria for uranium in sediment in inland saline waters.
Objective/Criterion Reference: | Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | One station, Amargosa River below Willow Creek, was sampled.
Temporal Representation: | One sediment sample was collected on March 16, 2005.
Environmental Conditions: | The Amargosa River flows into California from Nevada and terminates in Death Valley. It is mostly ephemeral but there are perennial reaches. There is great seasonal and annual variability in flows. Most of the watershed is U.S. Bureau of Land Management or National Park land. The Amargosa River is not designated for the Municipal and Domestic Supply (MUN) beneficial use. The MUN use designation was removed in Basin Plan amendments that took effect in 2002. The rationale for removing the use included naturally high salinity and levels of toxic substances such as arsenic, and fluctuating water quantity that would make the river an unreliable supply if treatment were feasible. The perennial reaches of the Amargosa River and the associated riparian areas support a complex of rare, threatened or endangered fish and wildlife species. To Lahontan Water Board staffs knowledge, there are no salmonids in the river and there is no warm water fishery for human consumption.
QAPP Information: | The data meet the quality assurance requirements of the SWAMP QAPP.
QAPP Information Reference(s):

DECISION ID | 24515 | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)

Pollutant: | Vanadium
Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)(2010)
Revision Status | Revised
Impairment from Pollutant or Pollution: | Pollutant
Regional Board Staff Conclusion: | The LOE was incorrectly assigned to the waterbody so there is no data available for this waterbody/pollutant combination. The mapped representation of this waterbody was corrected this cycle. This decision is being decommissioned (to be retired next cycle) while a copy of it as a "Do Not List" now lives with the new mapped representation of this waterbody.
Regional Board Staff Decision Recommendation: | The mapped representation of this waterbody was corrected this cycle. This decision is being decommissioned (to be retired next cycle) while a copy of it as a "Do Not List" now lives with the new mapped representation of this waterbody which is Amargosa River (Willow Creek Confluence to Badwater).

Line of Evidence (LOE) for Decision ID 24515, Vanadium | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)
LOE ID: | 25096
Pollutant: | Vanadium
LOE Subgroup: | Pollutant-Water
Matrix: | Water
Fraction: | Total
Beneficial Use: | Inland Saline Water Habitat
Number of Samples: | 2
Number of Exceedances: | 0
Data and Information Type: | Fixed station physical/chemical (conventional plus toxic pollutants)
Data Used to Assess Water Quality: | The U.S. Geological Survey sampled this station on on March 18, 2004 and March 16, 2005 under the Region 6 SWAMP program. The concentration of total vanadium in 1 of 2 samples was 10 ug/L; vanadium was detected but not quantified in the other sample.
Data Reference: | 2007. SWAMP Data for the Amargosa Hydrologic Unit
SWAMP Data: | SWAMP
Water Quality Objective/Criterion: | There are no applicable state or federal saltwater aquatic life standards or criteria for total vanadium in inland saline waters.
Objective/Criterion Reference: | Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | One station, Amargosa River below Willow Creek, was sampled.
Temporal Representation: | Two samples were collected on March 18, 2004 and March 16, 2005.
Environmental Conditions: | The Amargosa River flows into California from Nevada and terminates in Death Valley. It is mostly ephemeral but there are perennial reaches. There is great seasonal and annual variability in flows. Most of the watershed is U.S. Bureau of Land Management or National Park land. The Amargosa River is not designated for the Municipal and Domestic Supply (MUN) beneficial use. The MUN use designation was removed in Basin Plan amendments that took effect in 2002. The rationale for removing the use included naturally high salinity and levels of toxic substances such as arsenic, and fluctuating water quantity that would make the river an unreliable supply if treatment were feasible. The perennial reaches of the Amargosa River and the associated riparian areas support a complex of rare, threatened or endangered fish and wildlife species. To Lahontan Water Board staffs knowledge, there are no salmonids in the river and there is no warm water fishery for human consumption.
QAPP Information: | The data meet the quality assurance requirements of the SWAMP QAPP.
QAPP Information Reference(s):
Line of Evidence (LOE) for Decision ID 24515, Vanadium | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)
LOE ID: | 25095
Pollutant: | Vanadium
LOE Subgroup: | Pollutant-Water
Matrix: | Water
Fraction: | Dissolved
Beneficial Use: | Inland Saline Water Habitat
Number of Samples: | 2
Number of Exceedances: | 0
Data and Information Type: | Fixed station physical/chemical (conventional plus toxic pollutants)
Data Used to Assess Water Quality: | The U.S. Geological Survey sampled this station on on March 18, 2004 and March 16, 2005 under the Region 6 SWAMP program. The concentration of dissolved vanadium in two samples were 12.4 and 13.2 ug/L
Data Reference: | 2007. SWAMP Data for the Amargosa Hydrologic Unit
SWAMP Data: | SWAMP
Water Quality Objective/Criterion: | There are no applicable state or federal saltwater aquatic life standards or criteria for dissolved vanadium in inland saline waters.
Objective/Criterion Reference: | Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | One station, Amargosa River below Willow Creek, was sampled.
Temporal Representation: | Two samples were collected on March 18, 2004 and March 16, 2005.
Environmental Conditions: | The Amargosa River flows into California from Nevada and terminates in Death Valley. It is mostly ephemeral but there are perennial reaches. There is great seasonal and annual variability in flows. Most of the watershed is U.S. Bureau of Land Management or National Park land. The Amargosa River is not designated for the Municipal and Domestic Supply (MUN) beneficial use. The MUN use designation was removed in Basin Plan amendments that took effect in 2002. The rationale for removing the use included naturally high salinity and levels of toxic substances such as arsenic, and fluctuating water quantity that would make the river an unreliable supply if treatment were feasible. The perennial reaches of the Amargosa River and the associated riparian areas support a complex of rare, threatened or endangered fish and wildlife species. To Lahontan Water Board staffs knowledge, there are no salmonids in the river and there is no warm water fishery for human consumption.
QAPP Information: | The data meet the quality assurance requirements of the SWAMP QAPP.
QAPP Information Reference(s):
Line of Evidence (LOE) for Decision ID 24515, Vanadium | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)
LOE ID: | 24922
Pollutant: | Vanadium
LOE Subgroup: | Pollutant-Sediment
Matrix: | Sediment
Fraction: | None
Beneficial Use: | Inland Saline Water Habitat
Number of Samples: | 1
Number of Exceedances: | 0
Data and Information Type: | Chemical monitoring of sediments
Data Used to Assess Water Quality: | The U.S. Geological Survey sampled sediment at this station on March 16, 2005 under the Region 6 SWAMP program. Results were reported as "bed sediment, smaller than 62.5 um, wet sieved, total digestion." The concentration of vanadium was 43 ug/g dry weight.
Data Reference: | 2007. SWAMP Data for the Amargosa Hydrologic Unit
SWAMP Data: | SWAMP
Water Quality Objective/Criterion: | There are no state or federal standards or criteria for vanadium in sediment in inland saline waters.
Objective/Criterion Reference: | Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | One station, Amargosa River below Willow Creek, was sampled.
Temporal Representation: | One sediment sample was collected on March 16, 2005.
Environmental Conditions: | The Amargosa River flows into California from Nevada and terminates in Death Valley. It is mostly ephemeral but there are perennial reaches. There is great seasonal and annual variability in flows. Most of the watershed is U.S. Bureau of Land Management or National Park land. The Amargosa River is not designated for the Municipal and Domestic Supply (MUN) beneficial use. The MUN use designation was removed in Basin Plan amendments that took effect in 2002. The rationale for removing the use included naturally high salinity and levels of toxic substances such as arsenic, and fluctuating water quantity that would make the river an unreliable supply if treatment were feasible. The perennial reaches of the Amargosa River and the associated riparian areas support a complex of rare, threatened or endangered fish and wildlife species. To Lahontan Water Board staffs knowledge, there are no salmonids in the river and there is no warm water fishery for human consumption.
QAPP Information: | The data meet the quality assurance requirements of the SWAMP QAPP.
QAPP Information Reference(s):

DECISION ID | 23980 | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)

Pollutant: | Ytterbium
Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)(2010)
Revision Status | Revised
Impairment from Pollutant or Pollution: | Pollutant
Regional Board Staff Conclusion: | The LOE was incorrectly assigned to the waterbody so there is no data available for this waterbody/pollutant combination. The mapped representation of this waterbody was corrected this cycle. This decision is being decommissioned (to be retired next cycle) while a copy of it as a "Do Not List" now lives with the new mapped representation of this waterbody.
Regional Board Staff Decision Recommendation: | The mapped representation of this waterbody was corrected this cycle. This decision is being decommissioned (to be retired next cycle) while a copy of it as a "Do Not List" now lives with the new mapped representation of this waterbody which is Amargosa River (Willow Creek Confluence to Badwater).

Line of Evidence (LOE) for Decision ID 23980, Ytterbium | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)
LOE ID: | 24921
Pollutant: | Ytterbium
LOE Subgroup: | Pollutant-Sediment
Matrix: | Sediment
Fraction: | None
Beneficial Use: | Inland Saline Water Habitat
Number of Samples: | 1
Number of Exceedances: | 0
Data and Information Type: | Chemical monitoring of sediments
Data Used to Assess Water Quality: | The U.S. Geological Survey sampled sediment at this station on March 16, 2005 under the Region 6 SWAMP program. Results were reported as "bed sediment, smaller than 62.5 um, wet sieved, total digestion." The concentration of ytterbium was 2 ug/g dry weight.
Data Reference: | 2007. SWAMP Data for the Amargosa Hydrologic Unit
SWAMP Data: | SWAMP
Water Quality Objective/Criterion: | There are no state or federal standards or criteria for ytterbium in sediment in inland saline waters.
Objective/Criterion Reference: | Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | One station, Amargosa River below Willow Creek, was sampled.
Temporal Representation: | One sediment sample was collected on March 16, 2005
Environmental Conditions: | The Amargosa River flows into California from Nevada and terminates in Death Valley. It is mostly ephemeral but there are perennial reaches. There is great seasonal and annual variability in flows. Most of the watershed is U.S. Bureau of Land Management or National Park land. The Amargosa River is not designated for the Municipal and Domestic Supply (MUN) beneficial use. The MUN use designation was removed in Basin Plan amendments that took effect in 2002. The rationale for removing the use included naturally high salinity and levels of toxic substances such as arsenic, and fluctuating water quantity that would make the river an unreliable supply if treatment were feasible. The perennial reaches of the Amargosa River and the associated riparian areas support a complex of rare, threatened or endangered fish and wildlife species. To Lahontan Water Board staffs knowledge, there are no salmonids in the river and there is no warm water fishery for human consumption.
QAPP Information: | The data meet the quality assurance requirements of the SWAMP QAPP.
QAPP Information Reference(s):

DECISION ID | 23981 | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)

Pollutant: | Yttrium
Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)(2010)
Revision Status | Revised
Impairment from Pollutant or Pollution: | Pollutant
Regional Board Staff Conclusion: | The LOE was incorrectly assigned to the waterbody so there is no data available for this waterbody/pollutant combination. The mapped representation of this waterbody was corrected this cycle. This decision is being decommissioned (to be retired next cycle) while a copy of it as a "Do Not List" now lives with the new mapped representation of this waterbody.
Regional Board Staff Decision Recommendation: | The mapped representation of this waterbody was corrected this cycle. This decision is being decommissioned (to be retired next cycle) while a copy of it as a "Do Not List" now lives with the new mapped representation of this waterbody which is Amargosa River (Willow Creek Confluence to Badwater).

Line of Evidence (LOE) for Decision ID 23981, Yttrium | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)
LOE ID: | 24923
Pollutant: | Yttrium
LOE Subgroup: | Pollutant-Sediment
Matrix: | Sediment
Fraction: | None
Beneficial Use: | Inland Saline Water Habitat
Number of Samples: | 1
Number of Exceedances: | 0
Data and Information Type: | Chemical monitoring of sediments
Data Used to Assess Water Quality: | The U.S. Geological Survey sampled sediment at this station on March 16, 2005 under the Region 6 SWAMP program. Results were reported as "bed sediment, smaller than 62.5 um, wet sieved, total digestion." The concentration of yttrium was 16 ug/g dry weight.
Data Reference: | 2007. SWAMP Data for the Amargosa Hydrologic Unit
SWAMP Data: | SWAMP
Water Quality Objective/Criterion: | There are no state or federal standards or criteria for yttrium in sediment in inland saline waters.
Objective/Criterion Reference: | Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | One station, Amargosa River below Willow Creek, was sampled.
Temporal Representation: | One sediment sample was collected on March 16, 2005.
Environmental Conditions: | The Amargosa River flows into California from Nevada and terminates in Death Valley. It is mostly ephemeral but there are perennial reaches. There is great seasonal and annual variability in flows. Most of the watershed is U.S. Bureau of Land Management or National Park land. The Amargosa River is not designated for the Municipal and Domestic Supply (MUN) beneficial use. The MUN use designation was removed in Basin Plan amendments that took effect in 2002. The rationale for removing the use included naturally high salinity and levels of toxic substances such as arsenic, and fluctuating water quantity that would make the river an unreliable supply if treatment were feasible. The perennial reaches of the Amargosa River and the associated riparian areas support a complex of rare, threatened or endangered fish and wildlife species. To Lahontan Water Board staffs knowledge, there are no salmonids in the river and there is no warm water fishery for human consumption.
QAPP Information: | The data meet the quality assurance requirements of the SWAMP QAPP.
QAPP Information Reference(s):

DECISION ID | 24402 | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)

Pollutant: | Zinc
Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)(2010)
Revision Status | Revised
Impairment from Pollutant or Pollution: | Pollutant
Regional Board Staff Conclusion: | The LOE was incorrectly assigned to the waterbody so there is no data available for this waterbody/pollutant combination. The mapped representation of this waterbody was corrected this cycle. This decision is being decommissioned (to be retired next cycle) while a copy of it as a "Do Not List" now lives with the new mapped representation of this waterbody.
Regional Board Staff Decision Recommendation: | The mapped representation of this waterbody was corrected this cycle. This decision is being decommissioned (to be retired next cycle) while a copy of it as a "Do Not List" now lives with the new mapped representation of this waterbody which is Amargosa River (Willow Creek Confluence to Badwater).

Line of Evidence (LOE) for Decision ID 24402, Zinc | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)
LOE ID: | 24938
Pollutant: | Zinc
LOE Subgroup: | Pollutant-Sediment
Matrix: | Sediment
Fraction: | None
Beneficial Use: | Inland Saline Water Habitat
Number of Samples: | 1
Number of Exceedances: | 0
Data and Information Type: | Chemical monitoring of sediments
Data Used to Assess Water Quality: | The U.S. Geological Survey sampled sediment at this station on March 16, 2005 under the Region 6 SWAMP program. Results were reported as "bed sediment, smaller than 62.5 um, wet sieved, total digestion." The concentration of zinc was ug/g dry weight.
Data Reference: | 2007. SWAMP Data for the Amargosa Hydrologic Unit
SWAMP Data: | SWAMP
Water Quality Objective/Criterion: | There are no state or federal standards or criteria for znc in sediment in inland saline waters. The Effects Range-Median for zinc in marine and estuarine sediments is 410 ug/g dry weight; see Long et al. (1995).
Objective/Criterion Reference: | Incidence of adverse biological effects within ranges of chemical concentrations in marine and estuary sediments. Environmental Management. 19, (1): 81-97
| Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | One station, Amargosa River below Willow Creek, was sampled.
Temporal Representation: | One sediment sample was collected on March 16, 2005.
Environmental Conditions: | The Amargosa River flows into California from Nevada and terminates in Death Valley. It is mostly ephemeral but there are perennial reaches. There is great seasonal and annual variability in flows. Most of the watershed is U.S. Bureau of Land Management or National Park land. The Amargosa River is not designated for the Municipal and Domestic Supply (MUN) beneficial use. The MUN use designation was removed in Basin Plan amendments that took effect in 2002. The rationale for removing the use included naturally high salinity and levels of toxic substances such as arsenic, and fluctuating water quantity that would make the river an unreliable supply if treatment were feasible. The perennial reaches of the Amargosa River and the associated riparian areas support a complex of rare, threatened or endangered fish and wildlife species. To Lahontan Water Board staffs knowledge, there are no salmonids in the river and there is no warm water fishery for human consumption.
QAPP Information: | The data meet the quality assurance requirements of the SWAMP QAPP.
QAPP Information Reference(s):
Line of Evidence (LOE) for Decision ID 24402, Zinc | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)
LOE ID: | 25097
Pollutant: | Zinc
LOE Subgroup: | Pollutant-Water
Matrix: | Water
Fraction: | Dissolved
Beneficial Use: | Inland Saline Water Habitat
Number of Samples: | 2
Number of Exceedances: | 0
Data and Information Type: | Fixed station physical/chemical (conventional plus toxic pollutants)
Data Used to Assess Water Quality: | The U.S. Geological Survey sampled this station on on March 18, 2004 and March 16, 2005 under the Region 6 SWAMP program. The concentrations of dissolved zinc in two samples were 2 and 2.8 ug/L.
Data Reference: | 2007. SWAMP Data for the Amargosa Hydrologic Unit
SWAMP Data: | SWAMP
Water Quality Objective/Criterion: | The California Toxics Rule's saltwater aquatic life standards for dissolved zinc include an acute toxicity limit of 90 ug/L and a chronic toxicity limit of 81 ug/L.
Objective/Criterion Reference: | Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | One station, Amargosa River below Willow Creek, was sampled.
Temporal Representation: | Two samples were collected on March 18, 2004 and March 16, 2005.
Environmental Conditions: | The Amargosa River flows into California from Nevada and terminates in Death Valley. It is mostly ephemeral but there are perennial reaches. There is great seasonal and annual variability in flows. Most of the watershed is U.S. Bureau of Land Management or National Park land. The Amargosa River is not designated for the Municipal and Domestic Supply (MUN) beneficial use. The MUN use designation was removed in Basin Plan amendments that took effect in 2002. The rationale for removing the use included naturally high salinity and levels of toxic substances such as arsenic, and fluctuating water quantity that would make the river an unreliable supply if treatment were feasible. The perennial reaches of the Amargosa River and the associated riparian areas support a complex of rare, threatened or endangered fish and wildlife species. To Lahontan Water Board staffs knowledge, there are no salmonids in the river and there is no warm water fishery for human consumption.
QAPP Information: | The data meet the quality assurance requirements of the SWAMP QAPP.
QAPP Information Reference(s):
Line of Evidence (LOE) for Decision ID 24402, Zinc | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)
LOE ID: | 25098
Pollutant: | Zinc
LOE Subgroup: | Pollutant-Water
Matrix: | Water
Fraction: | Total
Beneficial Use: | Inland Saline Water Habitat
Number of Samples: | 2
Number of Exceedances: | 0
Data and Information Type: | Fixed station physical/chemical (conventional plus toxic pollutants)
Data Used to Assess Water Quality: | The U.S. Geological Survey sampled this station on on March 18, 2004 and March 16, 2005 under the Region 6 SWAMP program. The concentration of total zinc in one of two samples was 4 ug/L and the other sample was an estimated value.
Data Reference: | 2007. SWAMP Data for the Amargosa Hydrologic Unit
SWAMP Data: | SWAMP
Water Quality Objective/Criterion: | There are no state or federal saltwater aquatic life standards or criteria for total zinc in inland saline waters.
Objective/Criterion Reference: | Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | One station, Amargosa River below Willow Creek, was sampled.
Temporal Representation: | Two samples were collected on March 18, 2004 and March 16, 2005.
Environmental Conditions: | The Amargosa River flows into California from Nevada and terminates in Death Valley. It is mostly ephemeral but there are perennial reaches. There is great seasonal and annual variability in flows. Most of the watershed is U.S. Bureau of Land Management or National Park land. The Amargosa River is not designated for the Municipal and Domestic Supply (MUN) beneficial use. The MUN use designation was removed in Basin Plan amendments that took effect in 2002. The rationale for removing the use included naturally high salinity and levels of toxic substances such as arsenic, and fluctuating water quantity that would make the river an unreliable supply if treatment were feasible. The perennial reaches of the Amargosa River and the associated riparian areas support a complex of rare, threatened or endangered fish and wildlife species. To Lahontan Water Board staffs knowledge, there are no salmonids in the river and there is no warm water fishery for human consumption.
QAPP Information: | The data meet the quality assurance requirements of the SWAMP QAPP.
QAPP Information Reference(s):

DECISION ID | 25447 | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)

Pollutant: | pH
Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)(2010)
Revision Status | Revised
Impairment from Pollutant or Pollution: | Pollutant
Regional Board Staff Conclusion: | The LOE was incorrectly assigned to the waterbody so there is no data available for this waterbody/pollutant combination. The mapped representation of this waterbody was corrected this cycle. This decision is being decommissioned (to be retired next cycle) while a copy of it as a "Do Not List" now lives with the new mapped representation of this waterbody.
Regional Board Staff Decision Recommendation: | The mapped representation of this waterbody was corrected this cycle. This decision is being decommissioned (to be retired next cycle) while a copy of it as a "Do Not List" now lives with the new mapped representation of this waterbody which is Amargosa River (Willow Creek Confluence to Badwater).

Line of Evidence (LOE) for Decision ID 25447, pH | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)
LOE ID: | 25194
Pollutant: | pH
LOE Subgroup: | Pollutant-Water
Matrix: | Water
Fraction: | None
Beneficial Use: | Warm Freshwater Habitat
Number of Samples: | 2
Number of Exceedances: | 0
Data and Information Type: | Fixed station physical/chemical (conventional plus toxic pollutants)
Data Used to Assess Water Quality: | The U.S. Geological Survey sampled this station on on March 18, 2004 and March 16, 2005 under the Region 6 SWAMP program. Two sample both had pH values of 8.7 units..
Data Reference: | 2007. SWAMP Data for the Amargosa Hydrologic Unit
SWAMP Data: | SWAMP
Water Quality Objective/Criterion: | .The Lahontan Basin Plan's objective for pH states: "In fresh waters with designated beneficial uses of COLD or WARM, changes in normal ambient pH levels shall not exceed 0.5 pH units. For all other waters of the region, the pH shall not be depressed below 6.5 nor raised above 8.5 units. The Regional Board recognizes that some waters of the Region may have natural pH levels outside of the 6.5 to 8.5 range. Compliance with the pH objective for these waters will be determined on a case-by-case basis."
Objective/Criterion Reference: | Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | One station, Amargosa River below Willow Creek, was sampled.
Temporal Representation: | Two samples were collected on March 18, 2004 and March 16, 2005.
Environmental Conditions: | The Amargosa River flows into California from Nevada and terminates in Death Valley. It is mostly ephemeral but there are perennial reaches. There is great seasonal and annual variability in flows. Most of the watershed is U.S. Bureau of Land Management or National Park land. The Amargosa River is not designated for the Municipal and Domestic Supply (MUN) beneficial use. The MUN use designation was removed in Basin Plan amendments that took effect in 2002. The rationale for removing the use included naturally high salinity and levels of toxic substances such as arsenic, and fluctuating water quantity that would make the river an unreliable supply if treatment were feasible. The perennial reaches of the Amargosa River and the associated riparian areas support a complex of rare, threatened or endangered fish and wildlife species. To Lahontan Water Board staffs knowledge, there are no salmonids in the river and there is no warm water fishery for human consumption.
QAPP Information: | The data meet the quality assurance requirements of the SWAMP QAPP.
QAPP Information Reference(s):

DECISION ID | 30018 | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)

Pollutant: | Gallium
Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)(2010)
Revision Status | Original
Impairment from Pollutant or Pollution: | Pollutant
Regional Board Staff Conclusion: | The LOE was incorrectly assigned to the waterbody so there is no data available for this waterbody/pollutant combination. The mapped representation of this waterbody was corrected this cycle. This decision is being decommissioned (to be retired next cycle) while a copy of it as a "Do Not List" now lives with the new mapped representation of this waterbody.
Regional Board Staff Decision Recommendation: |

Line of Evidence (LOE) for Decision ID 30018, Gallium | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)
LOE ID: | 24902
Pollutant: | Gallium
LOE Subgroup: | Pollutant-Sediment
Matrix: | Sediment
Fraction: | None
Beneficial Use: | Inland Saline Water Habitat
Number of Samples: | 1
Number of Exceedances: | 0
Data and Information Type: | Chemical monitoring of sediments
Data Used to Assess Water Quality: | The U.S. Geological Survey sampled sediment at this station on March 16, 2005 under the Region 6 SWAMP program. Results were reported as "bed sediment, smaller than 62.5 um, wet sieved, total digestion." The concentration of gallium was 13 ug/g dry weight.
Data Reference: | 2007. SWAMP Data for the Amargosa Hydrologic Unit
SWAMP Data: | SWAMP
Water Quality Objective/Criterion: | There are no state or federal standards or criteria for gallium in sediment in inland saline waters.
Objective/Criterion Reference: | Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | One station, Amargosa River below Willow Creek, was sampled.
Temporal Representation: | One sediment sample was collected on March 16, 2005.
Environmental Conditions: | The Amargosa River flows into California from Nevada and terminates in Death Valley. It is mostly ephemeral but there are perennial reaches. There is great seasonal and annual variability in flows. Most of the watershed is U.S. Bureau of Land Management or National Park land. The Amargosa River is not designated for the Municipal and Domestic Supply (MUN) beneficial use. The MUN use designation was removed in Basin Plan amendments that took effect in 2002. The rationale for removing the use included naturally high salinity and levels of toxic substances such as arsenic, and fluctuating water quantity that would make the river an unreliable supply if treatment were feasible. The perennial reaches of the Amargosa River and the associated riparian areas support a complex of rare, threatened or endangered fish and wildlife species. To Lahontan Water Board staffs knowledge, there are no salmonids in the river and there is no warm water fishery for human consumption.
QAPP Information: | The data meet the quality assurance requirements of the SWAMP QAPP.
QAPP Information Reference(s):

DECISION ID | 23882 | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)

Pollutant: | Total Kjeldahl Nitrogen (TKN)
Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)(2010)
Revision Status | Original
Impairment from Pollutant or Pollution: | Pollutant
Regional Board Staff Conclusion: | The LOE was incorrectly assigned to the waterbody so there is no data available for this waterbody/pollutant combination. The mapped representation of this waterbody was corrected this cycle. This decision is being decommissioned (to be retired next cycle) while a copy of it as a "Do Not List" now lives with the new mapped representation of this waterbody.
Regional Board Staff Decision Recommendation: | The mapped representation of this waterbody was corrected this cycle. This decision is being decommissioned (to be retired next cycle) while a copy of it as a "Do Not List" now lives with the new mapped representation of this waterbody which is Amargosa River (Willow Creek Confluence to Badwater).

Line of Evidence (LOE) for Decision ID 23882, Total Kjeldahl Nitrogen (TKN) | Region 6
Amargosa River (Upper Canyon to Willow Creek confluence)
LOE ID: | 25213
Pollutant: | Total Kjeldahl Nitrogen (TKN)
LOE Subgroup: | Pollutant-Water
Matrix: | Water
Fraction: | Total
Beneficial Use: | Inland Saline Water Habitat
Number of Samples: | 2
Number of Exceedances: | 0
Data and Information Type: | Fixed station physical/chemical (conventional plus toxic pollutants)
Data Used to Assess Water Quality: | The U.S. Geological Survey sampled this station on on March 18, 2004 and March 16, 2005 under the Region 6 SWAMP program. Two samples had TKN concentrations of 0.57 and 0.35 mg/L.
Data Reference: | 2007. SWAMP Data for the Amargosa Hydrologic Unit
SWAMP Data: | SWAMP
Water Quality Objective/Criterion: | There are no applicable state or federal saltwater aquatic life standards or criteria for total Kjeldahl nitrogen (TKN). The Lahontan Basin Plan's regionwide objective for biostimulatory substances states: "Waters shall not contain biostimulatory substances in concentrations that promote aquatic growths to the extent that such growths cause nuisance or adversely affect the water for beneficial uses."
Objective/Criterion Reference: | Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | One station, Amargosa River below Willow Creek, was sampled.
Temporal Representation: | Two samples were collected on March 18, 2004 and March 16, 2005.
Environmental Conditions: | The Amargosa River flows into California from Nevada and terminates in Death Valley. It is mostly ephemeral but there are perennial reaches. There is great seasonal and annual variability in flows. Most of the watershed is U.S. Bureau of Land Management or National Park land. The Amargosa River is not designated for the Municipal and Domestic Supply (MUN) beneficial use. The MUN use designation was removed in Basin Plan amendments that took effect in 2002. The rationale for removing the use included naturally high salinity and levels of toxic substances such as arsenic, and fluctuating water quantity that would make the river an unreliable supply if treatment were feasible. The perennial reaches of the Amargosa River and the associated riparian areas support a complex of rare, threatened or endangered fish and wildlife species. To Lahontan Water Board staffs knowledge, there are no salmonids in the river and there is no warm water fishery for human consumption.
QAPP Information: | The data meet the quality assurance requirements of the SWAMP QAPP.
QAPP Information Reference(s):